Concentration and Distribution of PCB Congeners in Isolated Ontario Lakes Contaminated by Atmospheric Deposition

1991 ◽  
Vol 48 (3) ◽  
pp. 371-381 ◽  
Author(s):  
C. R. Macdonald ◽  
C. D. Metcalfe
Keyword(s):  
Atmospheric Deposition ◽  
Yellow Perch ◽  
General Pattern ◽  
Dry Weight ◽  
Smallmouth Bass ◽  
Trophic Levels ◽  
Pcb Congeners ◽  
Significant Difference ◽  
Golden Shiner ◽  
Wet Weight

The concentration of 19 PCB congeners was analysed in biota, sediments, water, and suspended solids in four central Ontario lakes in which atmospheric deposition was the major source of PCB contamination. Input from the atmosphere resulted in total congener concentrations of 1–2 ng∙L−1 dissolved in water, 10–50 μg∙kg−1 (dry weight} in sediment, 5–10 μg∙kg−1 (wet weight) in biota from lower trophic levels (i.e. zooplankton, golden shiner (Notemigonus crysoleucas)), and 10–30 μg∙kg−1 (wet weight) in fish from upper trophic levels (yellow perch (Perca fiavescens), smallmouth bass (Micropterus dolomieui)). The dominant PCB congeners in the lakes were the trichlorobiphenyl congeners 31(28} and the hexachlorobiphenyl congeners 153 and 138, consistent with congener distributions reported for vapour- and particulate-bound PCBs in the atmosphere. Discriminant analysis indicated slight differences in congener patterns between the study lakes, but the general pattern for isolated lakes was substantially different from point-source contaminated lakes, primarily due to the high proportion of congeners 31(28). There was no significant difference in the total PCB concentrations in biota (lipid basis) between lakes, but within the lakes, total PCB concentrations were significantly higher in yellow perch than in biota from lower trophic levels.

scholarly journals Pengaruh Air Lindi dan Bio Slurry Sebagai Pupuk Organik Cair Terhadap Pertumbuhan Tanaman Mentimun (Cucumis sativus L)

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Budi Santoso ◽  
Saimul Laili ◽  
Tintrim Rahayu
Keyword(s):  
Cucumis Sativus ◽  
Block Design ◽  
Liquid Waste ◽  
Dry Weight ◽  
Cucumber Plant ◽  
Cucumis Sativus L ◽  
Weight Concentration ◽  
Significant Difference ◽  
Wet Weight ◽  
Leachate Water

Leachate water is liquid waste that can arise due to the entry of water in landfills and can dissolve dissolved chemical elements such as organic matter resulting from decomposition. Slurry that has been lost gas is waste from biogas and is rich in nutrients needed in plants, but so far liquid leachate fertilizer and biogas waste have not been utilized properly. The purpose of this study was to determine the effect of leachate, bio slurry, and mixture on cucumber plant growth (Cucumis sativus L), and the best influence between leachate, bio slurry and a mixture of both. This study used an experimental method with randomized block design (RBD) with 9 treatments and 4x replications. The results of the study of Leachate Water, Bio slurry, and Mixture affected, plant length, on plant height, number of leaves, number of flowers, dry weight and plant wet weight. All treatments had an effect on the observed parameters at a concentration of 15 ml, 30 ml, or 45 ml, especially in observing wet weight and dry weight of plants. The treatment of leachate showed a significant difference in the wet weight concentration of 30 ml and dry weight concentration of 30 ml.Keywords: Leachate, Bio slurry, Cucumis sativus L ABSTRAKAir lindi adalah limbah cair dapat timbul karena masuknya air pada timbunan sampah dan bersifat dapat  melarutkan unsur kimiawi yang terlarut antara lain materi organik hasil dari dekomposisi. Kotoran ternak (slurry) yang sudah hilang gasnya merupakan limbah dari biogas  dan kaya dengan nutrisi yang di butuhkan pada  tanaman, namun selama ini pupuk cair air lindi dan limbah biogas belum dimanfaatkan dengan baik. Tujuan penelitian ini adalah mengetahui pengaruh air lindi, bio slurry, dan Campuran terhadap pertumbuhan tanaman mentimun (Cucumis sativus L), dan pengaruh yang terbaik antara air lindi, bio slurry dan campuran keduanya. Penelitian ini menggunakan metode eksperimen dengan rancangan acak kelompok (RAK) dengan 9 perlakuan dan 4x ulangan. Hasil penelitian Pemberian Air lindi, Bio slurry, dan Campuran berpengaruh , panjang tanaman, terhadap pada tinggi tanaman, jumlah pada daun, jumlah bunga, berat kering dan berat basah tanaman, Semua perlakuan memberikan pengaruh pada parameter yang di amati baik pada konsentrasi 15 ml, 30 ml, ataupun 45 ml, khususnya pada pengamatan berat basah dan berat kering tanaman. Pada perlakuan Air lindi menunjukkan beda nyata yang signifikan yaitu pada berat basah konsentrasi  30 ml dan berat kering konsentrasi 30 ml.  Kata kunci: Air lindi,Bio slurry,Cucumis sativus L

scholarly journals Mercury Bioaccumulation in Benthic Invertebrates: From Riverine Sediments to Higher Trophic Levels

Toxics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 197
Author(s):  
Laura Marziali ◽  
Claudio Roscioli ◽  
Lucia Valsecchi
Keyword(s):  
Benthic Invertebrates ◽  
Sediment Accumulation ◽  
Dry Weight ◽  
Quality Standard ◽  
Trophic Levels ◽  
Accumulation Factor ◽  
Trophic Chain ◽  
Top Predators ◽  
Riverine Sediments ◽  
Wet Weight

Riverine sediments are important sites of mercury methylation and benthic invertebrates may be indicators of Hg exposure to higher organisms. From 2014 to 2018, sediments and invertebrates were collected along a mercury gradient in the Toce River (Northern Italy) and analyzed for THg and MeHg. Concentrations in invertebrates, separated according to taxon and to Functional Feeding Group, ranged from 20 to 253 µg kg−1 dry weight (d.w.) for THg, increasing from grazers (Leuctra, Baetis, Serratella) to predators (Perla). MeHg ranged from 3 to 88 µg kg−1 d.w. in biota, representing 6–53% of THg, while in sediments it was mostly below LOD (0.7 µg kg−1), accounting for ≤3.8% of THg. The Biota-Sediment Accumulation Factor (BSAF, ranging 0.2–4.6) showed an inverse relation to exposure concentrations (THg in sediments, ranging 0.014–0.403 µg kg−1 d.w.) and to organic carbon. THg in invertebrates (up to 73 µg kg−1 wet weight), i.e., at the basal levels of the aquatic trophic chain, exceeded the European Environmental Quality Standard for biota (20 µg kg−1 w.w.), posing potential risks for top predators. Concentrations in adult insects were close to those in aquatic stages, proving active mercury transfer even to terrestrial food chains.

scholarly journals PENGARUH LAMA PERENDAMAN AIR KELAPA TERHADAP PERTUMBUHAN DAN HASIL TANAMAN BAWANG MERAH (Allium ascalonicum. L) PADA BERBAGAI MACAM MEDIA

2019 ◽  
Vol 13 (1) ◽  
pp. 33-44
Author(s):  
Fendi Ramdhani
Keyword(s):  
Water Immersion ◽  
Block Design ◽  
Dry Weight ◽  
Coconut Water ◽  
Growth And Yield ◽  
Randomized Block Design ◽  
Significant Difference ◽  
Wet Weight ◽  
Number Of Leaves ◽  
Number Of Shoots

Demand for shallots continues to increase due to increasing population and consumption of mera onions. This research was carried out in jingglong village, Sutojayan sub-district, Blitar district in April - June 2018. This research was conducted using factorial randomized block design (RBD) with 2 factors, the first factor was immersion in coconut water (k) which consisted of 3 levels namely immersion for 1 hour (k1) soaking for 2 hours (k2) soaking for 3 hours (k3). The second factor is various media (m) consisting of 3 levels: soil 1: fertilizer 1: husk ash 1 (m1), soil 2: fertilizer 1: husk ash 1 (m2), soil 1: fertilizer 2: husk ash 1 ( m3) The variables observed included plant height, number of shoots, number of leaves, weight of tuber stover, wet weight of tubers, dry weight of tubers. Data were analyzed using analysis of variance (ANOVA) level of 5% and further testing with Duncan's Multiple Range Test (DMRT). There is no real interaction between coconut water immersion and various planting media on the growth and yield of shallots. The treatment of coconut water immersion (k) significantly affected the height of shallot plants at the age of 14 days and 21 days, and affected the number of shoots and leaves at all ages of observation. The treatment of various planting media showed a significant difference at the age of 14 days to 21 days. The treatment of various planting media had a significant effect on the weight of stover and the wet weight of onion tubers with the highest yield (m1) of 122.03 gr, while in the wet weight the highest yield was on media (m1) with a yield of 80.51 gr.

scholarly journals The Utilization of Effective Microorganism 4 (EM4) on Growth of Oil Palm Seedling in Pre Nursery

2020 ◽  
Vol 3 (2) ◽  
pp. 39
Author(s):  
Dwi Astutik ◽  
Ratih Rahhutami ◽  
Aline Sisi Handini ◽  
Ahmad Sutopo
Keyword(s):  
Oil Palm ◽  
Research Method ◽  
Dry Weight ◽  
Shoot Dry Weight ◽  
Randomized Design ◽  
Significant Difference ◽  
Wet Weight ◽  
Number Of Leaves ◽  
Completely Randomized Design ◽  
Effective Microorganism

<em>A planting medium that rich in nutrients is needed for oil palm, especially in the nursery phase. This study aimed to determine the effect of various doses of EM4 and to get the best dose of EM4 on the growth of oil palm seedlings in the pre-nursery. The research method used was a non-factorial completely randomized design with 4 treatments, namely 0 ml EM4 (A1), 4 ml EM4 (A2), 8 ml EM4 (A3), and 12 ml EM4 (A4). Each treatment was repeated 6 times so that there were 24 experimental units. The data obtained were analyzed for variance at the 5% level, if the effect was real, it was followed by the least significant difference (LSD) test. Based on the results of the study, it could be concluded that application of various EM4 doses had a significant effect on plant height (4-12 MST), the number of leaves (4-8 MST), trunk girth (4-12 MST), and shoot wet weight but did not significantly affect the number of leaves (12 MST), the volume of roots, length of roots, root wet weight and shoot dry weight, dry weight root, the best dose was shown at a dose of 12 ml EM4.</em>

scholarly journals Effectivity of Trichoderma harzianum as Bio-fungicide Against Moler Disease and Bio-stimulator of Shallot Growth

2020 ◽  
Vol 1 (1) ◽  
pp. 12
Author(s):  
Icha Rusita ◽  
Hadi Sasongko
Keyword(s):  
Trichoderma Harzianum ◽  
Dry Weight ◽  
Positive Control ◽  
Negative Control ◽  
Correlation Pattern ◽  
Randomized Design ◽  
Significant Difference ◽  
Wet Weight ◽  
Number Of Leaves ◽  
Completely Randomized Design

Moler disease is the primary disease that disturbs the shallot’ cultivation. Hence, it is beneficial to have preventive measures to mitigate the risk and to improve growth. The research objective is to know the effectivity of Trichoderma harzianum suspension as a bio-fungicide and bio-stimulator. The study used seven treatments, i.e., immersion of shallot seeds on negative control (distilled water), positive control (synthetic fungicide+ZPT 1g/liter), T.harzianum suspension with different concentrations of 2 ppm, 4 ppm, 6 ppm, 8 ppm, and 10 ppm, assigned in a Completely Randomized Design (CRD). Treatment that results in a significant level will be continued to the Least Significance Different (LSD) 5% test. The observed variables are the intensity of moler disease and the growth of shallot seeds. Experiment results show the significant difference between treatments. The optimal treatment to reduce the percentage of moler disease intensity is the immersion of shallot seeds in 10 ppm-concentrated T.harzianum suspension, while to improve the shallot growth is in 8 ppm-concentrated T.harzianum suspension. The intensity of moler disease has a negative correlation to the plant’s height and leaf’s diameter but shows no correlation pattern to the number of leaves, wet weight, dry weight, and length of roots.

A Comparison of PCB Congener Distributions in Two Point-Source Contaminated Lakes and One Uncontaminated Lake in Ontario

1989 ◽  
Vol 24 (1) ◽  
pp. 23-46 ◽  
Author(s):  
C. R. Macdonald ◽  
C. D. Metcalfe
Keyword(s):  
Point Source ◽  
Yellow Perch ◽  
Water Solubility ◽  
Smallmouth Bass ◽  
Physical Factors ◽  
Organic Carbon Content ◽  
Substitution Pattern ◽  
Significant Difference ◽  
The Individual ◽  
High Organic Carbon Content

Abstract PCB congener accumulation in biota and sediments involves several processes, including physical factors characterized by octanol-water partition coefficients and water solubility, and chemical factors which are influenced by the degree of chlorination and the substitution pattern of the individual congeners. The present study was conducted to determine if PCB congeners are distributed in a consistent pattern in two lakes known to have received point-source contamination with PCBs, and a control lake with no known point source. Samples of 4 groups of biota, water and sediment indicated that each lake had a unique pattern of congener distribution which was probably related to the source of the contamination. A comparison of total and individual PCB congener concentrations within each study lake showed that no one species consistently contained the highest residues of PCBs. Smallmouth bass had the highest concentration of PCBs in Rice lake while yellow perch was highest in Lakes Clear and Scugog. Sediments contained lower concentrations of PCBs than biota and did not show enrichment of higher chlorinated congeners, despite having high organic carbon content. Within the contaminated lakes, young-of-the-year (YOY) and older yellow perch had the same congener pattern, and there was no significant difference in their PCB concentration. This indicates that equilibrium concentrations of PCBs are established rapidly in the young fish and that all congeners equilibrate at the same rate.

scholarly journals Growth Response of Soybean Varieties to Trichoderma Application on Acid Soils

2021 ◽  
Vol 316 ◽  
pp. 03007
Author(s):  
Sutarman ◽  
A. Miftahurrohmat
Keyword(s):  
Growth Response ◽  
Acid Soils ◽  
Dry Weight ◽  
Randomized Design ◽  
Affected Plant ◽  
Significant Difference ◽  
Wet Weight ◽  
Completely Randomized Design ◽  
Difference Test ◽  
Honest Significant Difference Test

This study aims to determine the growth response of the vegetative stadia of three soybean varieties which are widely used in East Java on acid soils that have been given biological fertilizers from various Trichoderma isolates. The experiment was arranged factorially using a completely randomized design. The first factor was the variety consisting of Detam 3, Detam 4, Gema, Dering 1, and Burangrang. The second factor was Trichoderma isolates formulated as bio fertilizers, consisting of Tc-Jjr-02, Tc-Pjn-01, and Tc-Jro-01. Overall this experiment has 60 experimental units. Data were analyzed by variance analysis (ANOVA) followed by an honest significant difference test at the level of 5%. The results showed that there was no interaction between soybean varieties and Trichoderma isolates formulated in bio fertilizer. Soybean varieties significantly affected plant height, wet weight, and dry weight of roots and stover at 21 days after planting. The Burangrang variety shows the best growing ability in acid soils. There was no interaction between soybean varieties and Trichoderma bio fertilizers. Trichoderma isolate Tc-Jjr-02 increased the wet weight and dry weight of the roots and roots by 48.2 and 54.5%, respectively, and 38.9 and 48.2% compared to without Trichoderma. Trichoderma application maintains soil acidity between pH 4.50-4.67.

scholarly journals Various Soil Types, Organic Fertilizers and Doses with Growth and Yields of Stevia rebaudiana Bertoni M

2019 ◽  
Vol 3 (1) ◽  
pp. 57 ◽  
Author(s):  
Dian Pratama Putra Saragih ◽  
Azwar Ma'as ◽  
Soepriyanto Notohadisuwarno
Keyword(s):  
Agricultural Research ◽  
Organic Fertilizer ◽  
Stevia Rebaudiana ◽  
Dry Weight ◽  
Organic Fertilizers ◽  
Soil Types ◽  
Stevia Rebaudiana Bertoni ◽  
Randomized Design ◽  
Significant Difference ◽  
Wet Weight

Stevia has several advantages including the level of sweetness that reaches 100-200 the sweetness of sugar cane and low calorie so that it is safe to be consumed by diabetics and obesity. The possibilities of plants to grow on soil properties and fertility become an important issue in agricultural cultivation systems and with the treatment of organic fertilizers will produce significant results in agricultural research. The experiments were arranged in Completely Randomized Design (CRD) with 3 various soil types of treatment factors: Alfisol (Al), Andisol (An) and Vertisol (Ve) soil with 2 types of organic fertilizer ie Compost (K) and Manure (SK) and 3 kinds of doses 20 ton/ha (12 g/pot), 40 ton/ha (24 g/pot) and 60 ton/ha (36 g/pot). Observational data were analyzed using variance analysis (ANOVA), if there was a real significant difference, the Duncan 5% real level to know the comparison between treatments. The results showed that the soil type of Vertisol given by compost fertilizer at 40 ton/ha (24 g/pot) gave the highest yield on all agronomic parameters, i.e. number of leaves, number of clumps, plant length, dry weight and wet weight. The result of production analysis shows that stevia at lowland can yield higher, on vertisol 2,7 ton/ha, alfisol 1 ton/ha and andisol 0,4 ton/ha whereas in highland that yield only 0,3 ton / ha (standard fertilizers) but with increasing amounts of biomass of stevia leaves can increase stevioside levels significantly.

scholarly journals IMPACT OF THE INVASIVE CUSCUTA CAMPESTRIS ON VEGETATIVE COVER AND PLANT BIODIVERSITY IN HOMA- BAY COUNTY

2021 ◽  
Vol 6 (1) ◽  
pp. 39-45
Author(s):  
Orwah Akoth ◽  
Okeyo Owuor ◽  
D Nyamai
Keyword(s):  
Host Plants ◽  
Photosynthetic Capacity ◽  
Dry Weight ◽  
Plant Biodiversity ◽  
Vegetative Cover ◽  
Significant Difference ◽  
Cuscuta Campestris ◽  
Wet Weight ◽  
The Mean ◽  
The Impact

Purpose: This research paper focused on the impact of Cuscuta campestris on vegetative cover and plant biodiversity in Homa-Bay County. The specific objective was to investigate the impact on plant growth and development with indicator as photosynthetic capacity of preferred host plants and chlorophyll content and leaf weight as the parameters. Methodology: The study was conducted in hot-spot areas of invasion, Rachuonyo North, Homa Bay town and Suba North using Completely Randomized Experimental Block Design. The data was collected through field observation and laboratory analysis. The study used descriptive and correlation data analysis procedures to show the impact on photosynthetic capacity, ANOVA to determine statistical significant difference among the obtained results for each parameter of the infected and uninfected samples. Variance analysis were conducted using SPSS 20 (IBM Corp. Armonk, NY, USA) and differences between means tested by ANOVA. Values of P ≤ 0.05 were considered significantly different. Findings: The results showed that the invasion was more intense in Theveta peruvinia and Euphorbia tirucalli species. Mean leaf amounts of chlorophyll were observed to decline with chlorophyll a from 3.97 to 1.59 mg/g and chlorophyll b from 2.65 to 1.18 mg/g and total chlorophyll value from 6.62 to 2.76 mg/g on infection resulting to reduced photosynthetic efficiency and low organic material formation. Leaf wet and dry weight significantly decreased in both infected varieties. The mean wet weight of 17.61g in infected was significantly different, F (1, 4) = 235.74, p< .05, from the mean wet weight of 24.23g in the uninfected Yellow Oleander while the mean dry weight of 5.55g in infected was significantly different, F (1, 4) = 159.72, p< .05, from mean dry weight of 7.87g in uninfected Yellow Oleander. Similarly, significant difference, F (1, 4) = 714.64, p< .05, was observed in Calliandra calothyrsus variety. These demonstrated how C. campestris is detrimental causing ecological impacts with direct effects on plant biodiversity by reducing growth and development of infected host plant and even leading to death. Unique Contributions to Theory, Practice and Policy: The paper recommends intense sensitization of the community on the impacts of dodder from the findings for an enhanced understanding and need for management and control. The findings to be disseminated through workshops involving farmers, NGOs and community based organisations, academic conferences and publications to help create awareness on the impacts and mobilize the entire public on management and possible total eradication. Further research to investigate on nutrients of attraction in the preferred host plants with an aim of permanent solution for total eradication in order to restore the vegetative cover and plant biodiversity.

scholarly journals Contamination of Omnivorous Freshwater Fish Species and Sediments by Chlorinated Hydrocarbons in Poland

2014 ◽  
Vol 58 (3) ◽  
pp. 405-411 ◽  
Author(s):  
Alicja Niewiadowska ◽  
Tomasz Kiljanek ◽  
Stanisław Semeniuk ◽  
Jan Żmudzki
Keyword(s):  
Organochlorine Pesticides ◽  
Aquatic Ecosystems ◽  
Dry Weight ◽  
Rutilus Rutilus ◽  
Fish Meat ◽  
Pcb Congeners ◽  
Vistula River ◽  
Spatial Differences ◽  
Wet Weight ◽  
The Mean

Abstract The occurrence and concentrations of organochlorine pesticides and polychlorinated biphenyls (PCBs) were determined in 158 muscle samples of bream (Abramis brama) and roach (Rutilus rutilus), and 84 samples of sediments collected from 10 river and lake sampling sites in 2011 and 2012. The concentrations of DDTs (p,p’-DDT, o,p’-DDT, p,p’-DDE, and p,p’-DDD), HCH isomers (a-, ß-, and y-HCH), HCB, and PCBs (six indicator PCB congeners 28, 52, 101, 138, 153 and 180) were determined using the capillary gas chromatography. The mean concentrations of DDTs in bream and roach were in the range of 11.2-654 and 4.5-121 ug/kg wet weight respectively, and PCBs were in the range of 1.3-75.9 and 1.1-112 ug/kg wet weight, respectively. Mean concentrations of DDTs and PCBs in sediments were 0.5-270 ug/kg dry weight and ⋋0.1-2.2 ug/kg dry weight respectively. The study showed clear spatial differences in the levels of organochlorine pesticides and PCBs in fish and sediments from different aquatic ecosystems. The highest levels of contaminants were detected in fish and sediments from the Vistula River in vicinity of Cracow. The possible risk to the fish meat consumers and ecological risk were evaluated.

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