Inhibition of methanogenesis in pure cultures by ammonia, fatty acids, and heavy metals, and protection against heavy metal toxicity by sewage sludge

1987 ◽  
Vol 33 (6) ◽  
pp. 551-554 ◽  
Author(s):  
Ken F. Jarrell ◽  
Michelle Saulnier ◽  
Art Ley
Keyword(s):  
Heavy Metals ◽  
Fatty Acids ◽  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Toxicity ◽  
Heavy Metal Toxicity ◽  
Methanosarcina Barkeri ◽  
Methanospirillum Hungatei ◽  
Nickel Zinc ◽  
Pure Cultures

The effect of ammonium chloride, sodium butyrate, sodium propionate, and the heavy metals nickel, zinc, and copper on methanogenesis by pure cultures of Methanospirillum hungatei, Methanosarcina barkeri, Methanobacterium thermoautotrophicum, and Methanobacterium formicicum at pH 6.5 was studied. The latter three strains were resistant to > 60 g/L of the volatile fatty acids and to > 10 g/L of NH3 N. Methanospirillum hungatei was somewhat more sensitive with 50% inhibition of methanogenesis occurring at 4.2 g/L NH3 N, 27 g/L butyrate, and 41 g/L propionate. All strains were very sensitive to both copper (1–5 mg/L) and zinc (1–10 mg/L), but much more resistant to nickel. Zinc and copper concentrations 30 to 270 times higher were required to cause inhibition of Msp. hungatei incubated in sewage sludge compared with buffer, indicating a strong protective environment was afforded the methanogens against heavy metal toxicity in the sludge.

scholarly journals Assessment of Awareness Regarding Heavy Metal Toxicity in School Children

2021 ◽  
pp. 111-116
Author(s):  
D. R. Gajbhiye ◽  
N. N. Wadnerwar
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Human Body ◽  
School Children ◽  
Metal Toxicity ◽  
Daily Life ◽  
Body Awareness ◽  
Heavy Metal Toxicity ◽  
Cross Sectional ◽  
Awareness Programs

Background: Heavy metal toxicity is increasing rapidly due to the increased use of products containing heavy metals daily life. It can cause acute or chronic toxicity if they used for long term unknowingly especially by the children. Objectives: To assess whether the school children have information about products containing heavy metal which are used in daily life and their hazardous effects with the help of structured questionnaire. To sensitize the school children about the products containing heavy metal which are used in daily life and their hazardous effects. Methods: Descriptive (cross sectional) observational study was designed among 300 primary and secondary school children. The questionnaires containing fifteen questions each carrying two marks (total 30 marks) about the products containing heavy metal and their hazardous effects on human body were given to students to fill the information and answers to the questions. Next day a sensitization program was conducted which was followed by the same questionnaire. The questionaries were assessed as pre and posttest. Result: All the students scored zero marks in the pretest. Hence, they were graded in no awareness category. After sensitization, in posttest 155 students (51.6%) scored between 21-30 marks and 144 students scored between 11-20 marks. The score of marks in posttest is highly significant. Conclusion: Results indicate that there was no awareness in school children about the products containing heavy metal and their hazardous effects on human body. Awareness increased after the sensitization. Hence, to avoid the heavy metal toxicity in school children, it is highly recommended to make them aware regarding sources of heavy metals which are used in daily life and their hazardous effects on body. It can be done through awareness programs to be conducted at schools. It may be achieved by incorporating this point into the syllabus of the school children.

scholarly journals Hubungan timbal dan krom pada pemakaian pewarna batik dengan kadar hemoglobin dan jumlah sel darah pada pengrajin batik Kecamatan Lendah Kulon Progo

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Pramudji Hastuti ◽  
Sunarti Sunarti ◽  
Prasetyastuti Prasetyastuti ◽  
Ngadikun Ngadikun ◽  
Tasmini Tasmini ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Cell Volume ◽  
Packed Cell Volume ◽  
Inductively Coupled Plasma ◽  
Metal Toxicity ◽  
Skin Irritation ◽  
Heavy Metal Toxicity ◽  
Water Levels ◽  
Inductively Coupled

ABSTRAK Cara membatik di Indonesia mulai banyak beralih dari pemakaian bahan alami menjadi bahan cat sintesis. Cat sintetis yang digunakan sering kali mengandung logam berat di antaranya timbal (Pb) dan kromium (Cr). Pemakaian logam berat dalam waktu lama akan mengganggu kesehatan. Penelitian ini dilakukan untuk melihat hubungan kadar logam Pb dan Cr dalam darah dan limbah dengan kadar hemoglobin (Hb) dan Packed Cell Volume (PCV) serta mengetahui prevalensi gejala toksisitas yang dirasakan pada pekerja di tiga sentra batik di Desa Lendah Kulon Progo. Sebanyak 76 pegawai di sentra batik: 37 orang di sentra SB, 20 orang di FA dan 19 orang di SA ditentukan kadar Hb, PCV, kadar Pb dan Cr dengan metode Inductively coupled plasma (ICP). Air limbah lingkungan dari ketiga lokasi sentra batik diambil dan diperiksa kadar Pb dan Cr-nya. Hasil antara ketiga lokasi diuji normalitasnya dan dianalisis dengan analisis varian atau Kruskal-Wallis. Hubungan antara kadar Pb dan Cr baik darah maupun limbah dengan kadar logam berat dalam darah dianalisis dengan uji korelasi Pearson atau Spearman. Hasil dinyatakan berbeda bermakna jika p<0,05. Gejala penyakit yang dialami pekerja yang diperkirakan berhubungan dengan toksisitas logam berat dihitung frekuensinya. Antropometik, tekanan darah, kadar Hb, PCV dan logam berat dari ketiga lokasi yang diperiksa tidak berbeda bermakna (p>0,05). Kadar Pb darah dan krom di sentra SB dan FA berbeda signifikan dengan di sentra SA (p<0,05). Tidak terdapat korelasi yang signifikan secara statistik antara kadar Pb darah, Cr darah, dan Pb limbah dengan kadar Hb dan PCV. Gejala iritasi kulit, pusing, dan nyeri sendi dirasakan 37-49% repsonden. Kadar timbal dan krom darah pembatik di sentra SB dan FA lebih tinggi dari sentra SA. Tidak terdapat hubungan bermakna antara toksisitas Pb dan Cr dengan kadar Hb dan PCV. Gejala toksisitas di antara pekerja batik diperkirakan dapat terjadi karena toksisitas logam berat kronis akibat pemakaian cat batik.KATA KUNCI batik; hemoglobin; chromium; sel darah; timbal ABSTRACT The dye used to color batik has changed from natural to synthetic materials in several places in Indonesia. Synthetic paints often contain heavy metals including lead (Pb) and chromium (Cr). Chronic use of heavy metals can affect health. This study was conducted to examine the relationship between blood and waste water levels of Pb and Cr with hemoglobin (Hb) and Packed Cell Volume (PCV), and to determine how many workers felt the toxicity symptoms in three batik centers in Lendah Kulon Progo. A total of 76 batik center employees: 37, 20, and 19 people from the SB, FA, and SA centers were recruited. Determination of Hb, PCV, Pb and Cr levels were conducted with the Inductively coupled plasma (ICP) method. Wastewater from the three batik centers is taken and examined. The data were analyzed by One-way ANOVA or Kruskal-Wallis. Correlation anayses were performed with Pearson or Spearman correlation test. Results were considered significant if p<0.05. Disease symptoms experienced by workers that are estimated to be associated with heavy metal toxicity are calculated in frequency. Anthropometrics, blood pressure, Hb levels, PCV and heavy metals were not significantly different between centers (p>0.05). Blood Pb and Cr from the SB and FA were significantly different from those at the SA center (p<0.05). There were no statistically significant correlations between blood Pb levels, blood Cr, and Pb waste with hemoglobin and PCV levels. Symptoms of skin irritation, dizziness, and joint pain were felt by 37-49% of respondents. Blood levels of lead and chrome in the SB and FA centers are higher than the SA centers. There was no significant correlation between Pb and Cr toxicity with hemoglobin and PCV levels. Symptoms of toxicity among batik workers are thought to occur due to chronic heavy metal toxicity due to the use of synthetic paint.KEYWORDS batik; haemoglobin; chromium; blood cell; plumbum

scholarly journals Serum heavy metal levels in teenagers currently or formerly employed as gas station attendants

2018 ◽  
Vol 17 (2) ◽  
pp. 224-229 ◽  
Author(s):  
Ayobola Abolape Iyanda
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Toxicity ◽  
Heavy Metal Toxicity ◽  
Work History ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Metal Levels ◽  
Gas Station

Background: Reports are available indicating that leaded gasoline is still being made available in some parts of the world. Moreover it is also known that the crude from which petroleum products are obtained is rich in heavy metals. This means heavy metal toxicity from petrol contact is a possibility. The aim of this study is to assess selected heavy metal levels in teenagers who are currently and formerly employed as GSA.Materials and Methods: The study population consisted of teenagers divided into 3 groups. GROUP I was made up of 30 male subjects that are currently employed as GSA with less than 6 months work history; GROUP II composed of 34 male teenagers with work history in gas station not less than 20 months; GROUP III consisted of 22 male teenagers who were former attendants; the control group consisted of 35 participants, with no history of occupational exposure to fuel, or heavy metals. Information was obtained through questionnaire on demography, life-style and clinical symptoms of gasoline exposure. Serum heavy metal levels were estimated using atomic absorption spectrometry. Student’s t test and analysis of variance were employed to determine the level of significant difference. P < 0.05 was considered significant.Results and Discussion: The serum levels of lead, arsenic, nickel, cadmium, and aluminium of GSA in GROUPS I and II were significantly higher compared with control. On the other hand, there were significant increases in levels of lead and cadmium in GROUP III compared with control. Additionally, majority of test subjects in GROUPS I and II identified headache and fatigue as symptoms associated with workplace. Teenage GSA are prone to heavy metal toxicity and discontinuing contact with gas station environment did not resolve this occupational hazard.Conclusion: Gonadotoxic effect of some of these elements on these categories of subjects who are within reproductive stage is possible. Therefore appropriate measure should be taken to address it.Bangladesh Journal of Medical Science Vol.17(2) 2018 p.224-229

scholarly journals Development of Selenium Nanoparticle Based Agriculture Sensor for Heavy Metal Toxicity Detection

Agriculture ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 610
Author(s):  
Faheem Ahmed ◽  
Sourabh Dwivedi ◽  
Nagih M. Shaalan ◽  
Shalendra Kumar ◽  
Nishat Arshi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Toxicity ◽  
Environmental Concern ◽  
Heavy Metal Toxicity ◽  
Selenium Nanoparticles ◽  
Face Centered Cubic ◽  
Selenite Reduction ◽  
Vis Spectroscopy ◽  
Face Centered

The presence of heavy metals in increased concentrations in the environment has become a global environmental concern. This rapid increase in heavy metals in the environment is attributed to enhanced industrial and mining activities. Metal ions possess a lengthy half-life and property to bioaccumulate, are non-biodegradable and, thus, are a threat to the human health. A number of conventional spectroscopic and chromatographic techniques are being used for the detection of heavy metals, but these suffer from various limitations. Nano-based sensors have emerged as potential candidates for the sensitive and selective detection of heavy metals. Thus, the present study was focused on the synthesis of selenium nanoparticles (SeNPs) by using selenite-reducing bacteria in the development of a heavy metal toxicity biosensor. During the biosynthesis of selenium nanoparticles, supernatants of the overnight-grown culture were treated with Na2SeO32− and incubated for 24 h at 37 °C. The as-synthesized nanoparticles were characterized by UV–Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and transmission electron microscopy (TEM) analyses. XRD and TEM results confirmed the formation of SeNPs in sizes ranging from 35 to 40 nm, with face-centered cubic (FCC) structures. The bioreduction process and validation of the formation of SeNPs was further confirmed by FTIR studies. The reduction in the biosynthesis of SeNPs using bacterial metabolite due to heavy metal cytotoxicity was analyzed by the colorimetric bioassay (SE Assay). The inhibition of selenite reduction and loss of red color in the presence of heavy metals may serve as a biosensor for heavy metal toxicity analysis. Thus, this biosensor development is aimed at improving the sensitivity and specificity of analytic detection.

scholarly journals Heavy metals and carcinogenesis: a review

2021 ◽  
Vol 8 (1) ◽  
pp. 20-30
Author(s):  
Aous Kahtan Al-Mzaien
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Toxicity ◽  
Meta Analysis ◽  
Heavy Metal Toxicity ◽  
Treatment Interventions ◽  
Cancer Induction ◽  
Potential Study ◽  
Cadmium Lead

There has been a growing recognition regarding heavy metal toxicity owing to their position in cancer induction. The study is linked to heavy metals like titanium, arsenic, beryllium, cadmium, lead, mercury, nickel and radium. A meta-analysis was compiled using PubMed to determine existing exposure channels, forms of cancers caused, and treatment interventions for the metals. It was planned to lead potential study activities linked to heavy metals and cancer.

scholarly journals Toxic Metals and Non-Communicable Diseases in HIV Population: A Systematic Review

Medicina ◽  
2021 ◽  
Vol 57 (5) ◽  
pp. 492
Author(s):  
Opeyemi M. Folorunso ◽  
Chiara Frazzoli ◽  
Ifeyinwa Chijioke-Nwauche ◽  
Beatrice Bocca ◽  
Orish E. Orisakwe
Keyword(s):  
Heavy Metals ◽  
Systematic Review ◽  
Heavy Metal ◽  
Metal Toxicity ◽  
Communicable Diseases ◽  
Heavy Metal Toxicity ◽  
Health Concern ◽  
Hiv Positive ◽  
Non Communicable Diseases ◽  
Hiv Seropositive

Background and Objectives: HIV has been a serious global health concern since its discovery, with about 37.9 million people living with HIV worldwide as of 2018. Sub-Saharan Africa (SSA) accounts for 68% of the infection and contributed 74% of the 1.5 million deaths in 2013 despite having only 12% of the total world population residing in the region. This systematic review has attempted to determine the association between heavy metal toxicity and the occurrence of non-communicable diseases in the HIV/AIDS population. Materials and Methods: Three databases were systematically searched: PubMed, Scopus, and Google Scholar for studies written in English and published between 1 April 2000 and 12 April 2020. Studies were excluded if the main outcomes were not measured or did not meet the inclusion criteria. Results: All the six included studies are cross-sectional in design, and therefore were evaluated using the STROBE checklist. The data extraction was done using an extraction table; the ratio of female to male participants included in the study was 1.09:1. Qualitative analysis was used due to the heterogeneity in the heavy metal biomarkers and the outcome measured by the included studies. Two studies compared the concentration of heavy metals in HIV-positive and HIV-negative participants while one compared the levels between HAART-naïve and HAART-treated participants, and three determined the association between heavy metal toxicity and non-communicable diseases (liver fibrosis, anaemia, and reproductive parameters, respectively) in HIV-positive patients. Conclusions: Blood lead, cadmium, and mercury levels were higher in HIV-seropositive than -seronegative subjects, whereas serum zinc level was lower in HIV-seropositive than -seronegative subjects, but the causal association between heavy metals and non-communicable diseases in HIV subjects is largely unknown. Interdisciplinary research between nutrition, toxicology, and human health is envisaged for primary and secondary prevention and treatment.

scholarly journals Heavy metal–induced stress in eukaryotic algae—mechanisms of heavy metal toxicity and tolerance with particular emphasis on oxidative stress in exposed cells and the role of antioxidant response

2022 ◽  
Author(s):  
Beatrycze Nowicka
Keyword(s):  
Oxidative Stress ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Metal Toxicity ◽  
Cellular Localization ◽  
Antioxidant Response ◽  
Heavy Metal Toxicity ◽  
Eukaryotic Algae ◽  
Induced Stress

Abstract Heavy metals is a collective term describing metals and metalloids with a density higher than 5 g/cm3. Some of them are essential micronutrients; others do not play a positive role in living organisms. Increased anthropogenic emissions of heavy metal ions pose a serious threat to water and land ecosystems. The mechanism of heavy metal toxicity predominantly depends on (1) their high affinity to thiol groups, (2) spatial similarity to biochemical functional groups, (3) competition with essential metal cations, (4) and induction of oxidative stress. The antioxidant response is therefore crucial for providing tolerance to heavy metal-induced stress. This review aims to summarize the knowledge of heavy metal toxicity, oxidative stress and antioxidant response in eukaryotic algae. Types of ROS, their formation sites in photosynthetic cells, and the damage they cause to the cellular components are described at the beginning. Furthermore, heavy metals are characterized in more detail, including their chemical properties, roles they play in living cells, sources of contamination, biochemical mechanisms of toxicity, and stress symptoms. The following subchapters contain the description of low-molecular-weight antioxidants and ROS-detoxifying enzymes, their properties, cellular localization, and the occurrence in algae belonging to different clades, as well as the summary of the results of the experiments concerning antioxidant response in heavy metal-treated eukaryotic algae. Other mechanisms providing tolerance to metal ions are briefly outlined at the end.

scholarly journals The Assessment of Using the Sewage Sludge in Agriculture in Romania

2018 ◽  
Vol 55 (4) ◽  
pp. 700-703
Author(s):  
Carmelia Mariana Dragomir Balanica ◽  
Aurel Gabriel Simionescu ◽  
Iulian Gabriel Birsan ◽  
Cezar Ionut Bichescu ◽  
Cristian Muntenita
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Urban Area ◽  
Metal Toxicity ◽  
Wastewater Treatment Plants ◽  
Urban Wastewater ◽  
Usage Analysis ◽  
Urban Wastewater Treatment

Sewage sludge resulted from urban wastewater treatment plants is generally accepted as a valuable source of nutrient and soil conditioner for agricultural usage. Analysis of amount of heavy metals in sewage sludge is essential previous to utilization of the sludge to agriculture considering the inevitable risk of heavy metal toxicity to soil, vegetation and humans. The present paper aims to analyse the characteristics of the sewage sludge resulted in an urban area for 5 years. Sewage sludge generated from five wastewater treatment plants in the South and South Est part of Romania were analysed.

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