KANDUNGAN LOGAM BERAT KADMIUM (CD) DAN TIMBAL (PB) PADA Enhalus acoroides DIPANTAI SEGARA AYU, PANTAI SEMAWANG, DAN PANTAI MERTASARI PROVINSI BALI

Sanur Beach is one of the tourist destinations that is often visited by national or international tourists. The number of tourism activities can increase pollutants entering the waters, one of which is heavy metals. Heavy metal content in waters can come from various sources of activity, one of which is lead (Pb) and cadmium (Cd). Seagrass E. acoroides are found in the waters of Sanur Beach. Seagrass can absorb heavy metals because it interacts directly with the column to absorb metal ions in the water. The purpose of this study was to determine the value of bioconcentration and translocation factors for the heavy metal content of cadmium (Cd) and lead (Pb) in E. acoroides seagrass in the waters of Segara Ayu Beach, Semawang Beach, and Mertasari Beach and to determine their suitability with the quality standards of the Bali Governor Regulation. No. 16 of 2016, Permenkes RI. No. 32 of 2017 and SEPA of 2000. Sampling was carried out by purposive sampling method and the data obtained were analyzed using quantitative descriptive methods and methods. The highest bioconcentration factor in cadmium (Cd) leaves was at station II, namely 1.91 mg/kg, and the lowest was at station I with a value of 0.62 mg/kg. The highest bioconcentration factor in lead (Pb) leaves was at station II, namely,0.47 mg/kg and the lowest was at station I, namely 0.08 mg/kg. The highest bioconcentration factor in cadmium (Cd) roots was at station II, namely 1.23 mg/kg, and the lowest was at station III, namely 0.73 mg/kg. The highest bioconcentration factor in lead (Pb) root was at station II, namely 0.22 mg/kg and the lowest was at station III, namely 0.10 mg/kg. The highest translocation factor for cadmium (Cd) was at station II, namely 1.55 mg/kg, and the lowest at station I was 0.53 mg/kg, while for lead (Pb) the highest was found at station III, namely 2.45 mg/kg and the lowest was at station I which was 0.49 mg/kg. The content of cadmium (Cd) and lead (Pb) in seagrass does not meet the quality standards of the Bali Governor Regulation No. 16 of 2016, Permenkes RI. No 32 of 2017, but in sediments according to SEPA 2000.

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Monitoring of Heavy Metal Polution the Lead (Pb) with Bio Indicator Baung Fish (Hemibagrus nemurus) at the Musi River of South Sumatra

Jurnal Lahan Suboptimal ◽

10.33230/jlso.9.2.2020.503 ◽

2020 ◽

Vol 9 (2) ◽

pp. 127-138

Author(s):

Rizqi Safitri ◽

Jhon Riswanda ◽

Fahmy Armanda

Keyword(s):

Heavy Metal ◽

Metal Content ◽

Quality Standards ◽

Atomic Absorption Spectrophotometry ◽

Heavy Metal Content ◽

Food Control ◽

River Waters ◽

Quantitative Descriptive ◽

Musi River

Safitri R, Riswanda J, Armanda F. 2020. Monitoring of heavy metal polution the lead (Pb) with bio indicator baung fish (Hemibagrus nemurus) at the Musi River of South Sumatra. Jurnal Lahan Suboptimal : Journal of Suboptimal Lands 9(2): 127-138.The high activity of the community in the musi river waters could affect the quality of river water, and can even caused water pollution and aquatic biota including fish baung (Hemibagrus nemurus) by lead heavy metals (Pb). This study aimed to determine the lead (Pb) heavy metal content of baung fish (H. nemurus) catches of fishermen in the musi river waters of palembang city. This research was conducted in May-June 2019. The method used is quantitative descriptive. The sample of this research is the meat, skin, liver, kidney and gill of baung fish (H. nemurus) which are tested for lead (Pb) heavy metal content using aas (atomic absorption spectrophotometry). The results of this study indicated that the concentration of heavy metal the lead (Pb) in fish baung (H. nemurus) in the waters of the musi river on the average meat of 0.046 mg/kg, on the skin of 0.058 mg/kg, in the liver of 0.1516 mg/kg, in the kidney at 0.2513 mg/kg, and in the gills at 0.2216 mg/kg. The Pb concentration on the meat, skin and liver samples were still below the established quality standards so that they were still suitable for consumption while the kidney and fish gill samples are above the quality standards that have been set based on the regulations of the Regulations Drug and Food Control Agency (DFCA) number 5 of 2018 which is equal to 0.20 mg/kg.

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Analisis kadar logam Pb, Cd, Cu, As pada air, sedimen dan bivalvia di Pesisir Teluk Balikpapan

Dinamika Lingkungan Indonesia ◽

10.31258/dli.7.2.p.89-94 ◽

2020 ◽

Vol 7 (2) ◽

pp. 89

Author(s):

Saibun Sitorus ◽

Yerwanto Ilang ◽

Rudy Agung Nugroho

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Content ◽

Field Survey ◽

Industrial Area ◽

Laboratory Analysis ◽

Heavy Metal Content ◽

Bioconcentration Factors ◽

Quantitative Descriptive ◽

The Village

Analysis of Heavy Metal Content of Pb, Cd, Cu, As in Water, Sediments and Bivalves in Coastal Waters of Balikpapan Bay. The study aims to analyze the levels of heavy metals (Pb, Cd, Cu, As) in water, sediment and Bivalvia and to determine the adsorption, bioconcentration factors in sediments and Bivalvia. This research is in the form of field survey and laboratory analysis, where the results are quantitative descriptive and analyzed statistically multivariate.The results of laboratory analysis showed that the levels of heavy metals in water ranged between (Pb 0.064-0.142 mg/L), (Cd 0.088-0.112 mg/L), (Cu 0.035-0.056 mg/L) and (As 0.022-0.026 mg/L). Sediment (Pb 2,555-2,616 mg/Kg), (Cd 2,433-2,609 mg/Kg), (Cu 1,289-1,553 mg/Kg), (As 0,329-0,496 mg/Kg) and Bivalvia (Pb 1,708-2,076 mg/Kg) ), (Cd 1.569-2.416 mg/Kg), (Cu 1.078-1.264 mg/Kg) and (As 0.297-0.449 mg/Kg). Heavy metal content of Pb, Cd, Cu and As in the sediment is greater than water or Bivalvia. The results of the statistical analysis partially showed that the levels of heavy metals Pb, Cd, Cu and As differed significantly between all study samples (water, sediment and Bivalvia). Whereas the observation stations (Kariangau industrial area, the village on the water and the PT. Pertamina area) did not differ significantly. The results of the analysis of adsorption and bioconcentration factors on the levels of heavy metals Pb, Cd, Cu and As in sediments (Pb 17.99-42.25), (Cd 22.75-28.67), (Cu 26.49-36.83 ) and (As 13.71-19.08). In Bivalvia (Pb 14.15-32.44), (Cd 14.00-26.55), (Cu 21.14-34.43) and As (13.50-29.88).

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Fish diversity and heavy metal content mercury (Hg), arsenic (As) on the water and fish in Cikaniki river, Bogor regency

Edubiotik Jurnal Pendidikan Biologi dan Terapan ◽

10.33503/ebio.v6i01.792 ◽

2021 ◽

Vol 6 (01) ◽

pp. 83-90

Author(s):

Mia Azizah ◽

Gladys Ayu Paramitha-K.W

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Fish Species ◽

Metal Content ◽

Environmental Changes ◽

Heavy Metal Content ◽

Fish Diversity ◽

Illegal Mining ◽

A Value ◽

Value Range

Organisms that live in waters are sensitive to changes in the water quality in which they live. The quality of the water in the Cikaniki River is threatened by the gold mining industry, illegal mining, agricultural activities, and settlements. One of the organisms that will be affected by these environmental changes is fish. This research aims to obtain a diversity index of fish species and to determine the content of heavy metals Mercury (Hg), Arsenic (As) on the water, and fish. Research on the diversity of fish in Cikaniki River, Bogor Regency, was carried out in January–March 2020. The research was conducted at five selected stations, and each station carried out three times the sampling of fish and water. The metal content test process is carried out at the Chemical Laboratory of the University of Nusa Bangsa. The research instrument used was the observation sheet for fish identification and heavy metal content. Fish identification was carried out at the Faculty of Mathematics and Natural Sciences Laboratory, University of Nusa Bangsa. Identification use characteristics observed included body shape, body length height, color pattern, muzzle shape, fin shape, number of fins, and tail shape. Calculation of heavy metals using an ICP–OES (Inductively Coupled Plasma) tool. This research found seven fish species in the Cikaniki river; based on its dominance, four types of fish dominate: Nemacheilus chrysolaimos, Puntius bionotatus, Channa striata, and Glyptothorax platypogonides. The content of heavy metal mercury (Hg) in water is still below the standard quality threshold, while the Hg content in fish is above the quality standard with a value range of 0.5 - 1.09 mg/kg. The content of heavy metal Arsenic (As) in water ranges from 0.02 - 0.6 mg/L, with the highest value found at stations 4 (irrigation canals), As in the highest fish at stations 1 and 2 with a value range of 1-1.1 mg/kg. The conclusion of this research is that there are seven species of fish and fish in the Cikaniki river which contain high Hg and As heavy metals.

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Status pencemaran dan kandungan logam berat pada simping (Placuna placenta) di Pesisir Kabupaten Tangerang

DEPIK ◽

10.13170/depik.3.2.1455 ◽

2014 ◽

Vol 3 (2) ◽

Author(s):

Anna Rejeki Simbolon ◽

Etty Riani ◽

Yusli Wardiatno

Keyword(s):

Water Pollution ◽

Heavy Metals ◽

Heavy Metal ◽

Coastal Water ◽

Coastal Waters ◽

Metal Content ◽

Quality Standards ◽

Heavy Metal Content ◽

Index Method ◽

The Status

Abstract. The objective of study was to analyze the status of water pollution and heavy metal content on water, sediment and scallop in Tangerang Coastal Waters. The Storet index method was used to determine the status of pollution. Sampling was conducted for three times at two months interval. The content of heavy metals in water, sediment and scallop analyzed descriptively based on the applicable regulations. The results showed that the status of Tangerang Coastal Water was classified as moderate and hight polluted. The content of Pb in scallop from Cituis Coastal has been exceeded the quality standards established by BPOMand WHO, so it is not sutible to consump.Keywords: pollution status; heavy metals; P.placenta; Tangerang Coastal Waters. Abstrak. Penelitian ini bertujuan untuk menganalisis status pencemaran perairan di Pesisir Kabupaten Tangerang dan kandungan logam berat pada air, sedimen dan simping di Pesisir Kabupaten Tangerang. Metode yang digunakan untuk mengetahui status pencemaran yaitu dengan metode indeks Storet. Pengambilan sampel dilakukan selama tiga kali dengan interval waktu dua bulan. Kandungan logam berat di air, sedimen dan simping dianalisis secara deskriptif berdasarkan peraturan yang berlaku. Hasil penelitian menunjukkan bahwa status perairan Pesisir Kabupaten Tangerang tergolong tercemar sedang hingga berat. Kandungan logam berat Pb pada simping di Perairan Cituis telah melampaui baku mutu yang ditetapkan baik menurut BPOM tahun 2009 maupun WHO, sehingga tidak baik untuk dikonsumsi.Kata kunci: Status pencemaran; Logam berat;P.placenta;Pesisir Kabupaten Tangerang

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Impact Imposed by Urbanization on Soil Heavy Metal Content of Lake Wetland and Evaluation of Ecological Risks in East Dongting Lake in China

10.21203/rs.3.rs-339557/v1 ◽

2021 ◽

Author(s):

Yang Lin ◽

Kai Luo ◽

Zilin Su ◽

Yang Wu ◽

Wei Xiao ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Land Use ◽

Metal Content ◽

Agricultural Land ◽

Research Area ◽

Dongting Lake ◽

Heavy Metal Content ◽

Ecological Risks ◽

Positive Correlation

Abstract The urbanization is regarded as the major factor related to human activities that may interfere with the natural ecosystem. In this study, we have selected the wetland of East Dongting Lake as the research area. We have collected 180 soil samples (within the range of 0–20 cm, and 20cm-40cm), and we have measured the contents of their physicochemical properties (including salinity, pH value, soil particle composition, soil organic carbon, nitrate nitrogen and rapidly available phosphorus) as well as heavy metal elements (including As, Hg, Cd, Pb, Ni and Cr). We have adopted the methods of multivariate statistical analysis and inverse distance weighted (IDW) interpolation, so as to to reveal the sources and distribution characteristics of heavy metal content in soil in the research area. By adopting the potential ecological risk index (PERI) method proposed by Hakanson, we intend to assess the PERI values of heavy metals. Our research findings have shown that: (1) 8 sorts of heavy metals have shown positive correlation with each other. As, Hg and Zn have shown a significantly positive correlation with SOC (P < 0.01); As, Ni, Cr and Zn have shown a significantly positive correlation with AP (P < 0.01); As and Pb have shown a significantly positive correlation with Clay (P < 0.01); whereas Hg and Zn have shown a significantly negative correlation with Silt (P < 0.01); As and Pb have shown a significantly negative correlation with Sand (P < 0.01). (2) During urbanization, the elements of Cd, Ni, As, Hg and Pb might be enriched due to agricultural and industrial activities, whereas the use of fertilizers and pesticides constitute one of the major factors contributing to the increase of Cd and Pb contents in soil. (3) Influenced by the varying land patterns and with exception to Cu, the Fe-normalized concentrations have shown significant variations among different types of land use (P < 0.05). Specifically, there is a significantly higher level of Cd, Zn, Pb and Hg contents in the agricultural land than other types of land use, whereas there is a slightly higher level of heavy metal content in the mudflats than that in the grassland. In addition, the content of heavy metals in woodland remains relatively stable, and with exception to As, the content of heavy metals in woodland is the lowest among the five types of land. (4) The average value of the comprehensive PERI in heavy metals amounts to 555.03, representing a strong degree of ecological risks. Specifically, the proportion of sampling points of Cd that have a high level of ecological risks amounts to 36.51%, which is the primary element contributing to heavy metal pollution in the region, especially in the agricultural land.

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The influence of soil microorganisms on heavy metal content in the substrate of waste rock dumps

BIO Web of Conferences ◽

10.1051/bioconf/20213100017 ◽

2021 ◽

Vol 31 ◽

pp. 00017

Author(s):

Natalia Makeeva ◽

Olga Neverova

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Content ◽

Soil Microorganisms ◽

Accumulation Rate ◽

Heavy Metal Content ◽

Waste Rock ◽

Soil Reclamation ◽

The Impact ◽

Concentration Limits

The environmental effects of mining and its impact on natural resources are of a holistic nature. One of the modern methods employed for the remediation of technogenically disturbed soils is the application of microorganisms. This paper studies the impact made by soil microorganisms on the accumulation rate of heavy metals in the substrate of waste rock dumps in the process of soil reclamation. Suspensions of soil microorganisms (microorganisms utilising mineral nitrogen forms / MUMN; microorganisms decomposing silicates / MDS; microscopic fungi / MF) were applied to the rock dump surface. Separate groups as well as their combinations were applied. The heavy metal content analysis did not indicate a significant exceedance of the maximum allowable concentration limits (MACL) in the soil of the waste rock. The only metal whose content exceeded the maximum admissible concentration limits was nickel. It has found that the application of microorganisms influences the concentration of several heavy metals due to pH level changes of the rock dump soil.

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HEAVY METAL CONTENT IN SOME SEAFOODS COLLECTED FROM MUARA ANGKE FISH AUCTION PLACE, JAKARTA.

Marine Research in Indonesia ◽

10.14203/mri.v26i1.407 ◽

1987 ◽

Vol 26 ◽

pp. 51-58

Author(s):

Horas Hutagalung ◽

Suwirma Syamsu

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Content ◽

Heavy Metal Content ◽

World Health ◽

Human Consumption ◽

Zn Content ◽

Standard Set ◽

Health Organization

Determination of heavy metal content (Hg, Pb, Cd, Cu, Cr, Zn) in some seafoods collected from Muara Angke Fish Auction Place were carried out during February to July 1979. The results showed that Zn content in seafoods a nalyzed was always much higher than the other heavy metals. The concentration levels of the six heavy metals observed were low. It is almost of the same level as the metal concentration of other seafoods observed in various parts of the world oceans, but still lower than the maximum standard set for human consumption as established by Tasmania, Australia and World Health Organization. The mean per capita consumption of fish in Jakarta is only about 165 g per week, while the Provisional Tolerated Weekly Intake for Hg, set by WHO/FAO at 300 ug level, would be attained by consuming 1500 g Rastrelliger sp., or 698 gPenaeus setiferus, or 545 g Sepia sp., and or 1250 g Pecten sp. Therefore, at present the level of metal content in fishes sold at TPI Muara Angke can be considered as not dangerous to human health as long as these quantities are not surpassed.

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Assessment of heavy metal content in tree barks: Picea abies, Pinus sylvestris, and Pinus nigra (RETRACTED)

BioResources ◽

10.15376/biores.16.3.5047-5057 ◽

2021 ◽

Vol 16 (3) ◽

pp. 5047-5057

Author(s):

Corneliu Tanase ◽

Adrian Nisca ◽

Argeime Lopez

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Picea Abies ◽

Pinus Sylvestris ◽

Metal Content ◽

Biological Activities ◽

Pinus Nigra ◽

Heavy Metal Content ◽

Potential Health ◽

Tree Barks

Extracts obtained from the bark of woody plants are used for their high content in polyphenolic compounds with various biological activities. Thus, it is important to evaluate the heavy metals in various tree barks, as these pollutants may end up in the final product, affecting its properties and having potential health implications. This study assessed the heavy metal content in the barks of spruce (Picea abies) and pine (Pinus sylvestris and Pinus nigra) collected from different areas in Romania. After collecting the vegetal material from different sites, the bark samples were appropriately processed and analyzed via inductively coupled plasma optical emission spectroscopy (ICP-OES). The results showed that 6 out of 8 tested samples exceeded the normal values of selenium (Se). Arsenic (As) and cadmium (Cd) were not detected in any sample, while other metals (chromium (Cr); lead (Pb); nickel (Ni)) were detected in variable amounts. Moreover, relatively high levels of heavy metals were recorded in a spruce bark sample collected from the seemingly most unpolluted site. Although further studies are needed to determine the effects of these heavy metals on extraction yields and their transfer into the final extracts, their presence might indicate a potential problem.

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Analisis Kandungan Logam Berat Pada Ikan Kakap Putih (Lates calcarifer Bloch) di Perairan Mimika Papua

Jurnal Ilmu Lingkungan ◽

10.14710/jil.17.2.256-263 ◽

2019 ◽

Vol 17 (2) ◽

pp. 256

Author(s):

Rosye H.R. Tanjung ◽

Suwito Suwito ◽

Vita Purnamasari ◽

Suharno Suharno

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Content ◽

Heavy Metal Contamination ◽

Sea Water ◽

Good Condition ◽

Quality Standard ◽

Heavy Metal Content ◽

Lates Calcarifer ◽

Tailings Sand

Kebutuhan bahan pangan sangat tergantung pada ketersediaanya di lingungan. Bahan pangan yang diperlukan untuk memenuhi kebutuhan sehari-hari harus sehat dan bebas dari bahan pencemar, termasuk logam berat. Ikan kakap putih (Lates calcarifer) sering dijumpai pada kawasan muara sungai di hampir seluruh wilayah Indonesia, bahkan di Papua. Tujuan penelitian ini adalah untuk mengkaji kandungan logam berat Pb, Cd, Cu, Fe, As, dan Hg pada ikan kakap putih (L. calcarifer) yang hidup di perairan estuari Mimika Papua. Perairan estuari di Mimika diketahui sebagai salah satu daerah pengendapan pasir sisa tambang (tailing). Metode yang digunakan adalah survei dan analisis laboratorium kandungan logam berat pada tubuh ikan. Analisis Pb, Cd, Cu, Fe, As, dan Hg ditentukan dengan spektroskopi serapan atom (AAS, Atomic Absorpsion Spectroscopy). Penentuan tingkat pencemaran logam berat dilakukan dengan Metode Standar APHA 3113 Cetac Technologies SPR IDA. Analisis data dilakukan dengan membandingkan kandungan logam berat dalam air dengan baku mutu air laut menurut SK MNLH No. 51 tahun 2004. Untuk kandungan logam berat pada organ tubuh ikan dibandingkan dengan kandungan maksimum logam berat berdasarkan SNI 7387: 2009 tentang batas maksimum cemaran logam berat bahan pangan. Kandungan logam berat pada ikan kakap putih masih tergolong aman dikonsumsi karena mengandung logam berat di bawah ambang batas baku mutu. Kondisi ini didukung oleh hasil analisis logam berat pada air yang menunjukkan masih dalam kondisi baik. Kata kunci: L. calcarifer, logam berat, Sungai Kamora, Sungai Ajkwa, Mimika. The need for food depends on the availability in the environment. Foods needed to meet daily needs should be healthy and free of pollutants, including heavy metals. White snapper (Lates calcarifer) is often found in the estuary of the river in almost all parts of Indonesia, even in Papua. The purpose of this research is to study the heavy metal content of Pb, Cd, Cu, Fe, As, and Hg on white snapper (L. calcarifer) which live in Mimika Papua estuary waters. The estuary waters of Mimika are known as one of the deposition areas of tailings sand. The method used is survey and laboratory analysis of heavy metal content in fish body. Analysis of Pb, Cd, Cu, Fe, and Hg was determined by Atomic Absorption Spectroscopy (AAS). Determination of the level of heavy metal contamination was done by Standard Method of APHA 3113 Cetac Technologies SPR IDA. Data analysis was done by comparing the heavy metal content in water with sea water quality standard according to SK MNLH No. 51 year 2004. For heavy metal content in fish body organs compared with maximum content of heavy metals based on SNI 7387: 2009 on the maximum limit of heavy metal food contamination. The content of heavy metals in white snapper is still considered safe for consumption because its below the quality standard threshold. This condition is supported by the results of heavy metal analysis on the water which shows still in good condition. Key words: L. calcarifer, heavy metal, Kamora River, Ajkwa River, Mimika.

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Use of Heavy Metal Content and Modified Water Quality Index to Assess Groundwater Quality in a Semiarid Area

Water ◽

10.3390/w12041115 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1115 ◽

Cited By ~ 4

Author(s):

Ehsan Maskooni ◽

Mehran Naseri-Rad ◽

Ronny Berndtsson ◽

Kei Nakagawa

Keyword(s):

Heavy Metals ◽

Water Quality ◽

Heavy Metal ◽

Water Supply ◽

Groundwater Quality ◽

Metal Content ◽

Quality Index ◽

Oxygen Demand ◽

Heavy Metal Content ◽

Entropy Weighted

Groundwater is a major source of drinking and agricultural water supply in arid and semiarid regions. Poor groundwater quality can be a threat to human health especially when it is combined with hazardous pollutants like heavy metals. In this study, an innovative method involving entropy weighted groundwater quality index for both physicochemical and heavy metal content was used for a semiarid region. The entropy weighted index was used to assess the groundwater’s suitability for drinking and irrigation purposes. Thus, groundwater from 19 sampling sites was used for analyses of physicochemical properties (electrical conductivity—EC, pH, K+, Ca2+, Na+, SO42−, Cl−, HCO3−, TDS, NO3−, F−, biochemical oxygen demand—BOD, dissolved oxygen—DO, and chemical oxygen demand—COD) and heavy metal content (As, Ca, Sb, Se, Zn, Cu, Ba, Mn, and Cr). To evaluate the overall pollution status in the region, heavy metal indices such as the modified heavy metal pollution index (m-HPI), heavy metal evaluation index (HEI), Nemerow index (NeI), and ecological risks of heavy metals (ERI) were calculated and compared. The results showed that Cd concentration plays a significant role in negatively affecting the groundwater quality. Thus, three wells were classified as poor water quality and not acceptable for drinking water supply. The maximum concentration of heavy metals such as Cd, Se, and Sb was higher than permissible limits by the World Health Organization (WHO) standards. However, all wells except one were suitable for agricultural purposes. The advantage of the innovative entropy weighted groundwater quality index for both physicochemical and heavy metal content, is that it permits objectivity when selecting the weights and reduces the error that may be caused by subjectivity. Thus, the new index can be used by groundwater managers and policymakers to better decide the water’s suitability for consumption.

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