scholarly journals Fixation and redistribution of arsenic during early and late diagenesis in the organic matter-rich members of the Lockatong Formation, Newark basin, USA: implication for the quality of groundwater

2017 ◽  
Vol 53 ◽  
pp. 253-268 ◽  
Author(s):  
Larbi Rddad
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Black Shale ◽  
Anoxic Conditions ◽  
Arsenic In Groundwater ◽  
Late Diagenesis ◽  
Rock Eval ◽  
Newark Basin

The Byram and Walls Island members in the lower and upper sections, respectively, of the Lockatong Formation in the Newark basin near the border between Pennsylvania and New Jersey were chosen to assess (i) the role of euxinic/anoxic conditions in sequestering arsenic (As) and other trace elements and (ii) the redistribution of these elements during catagenetic transformations. ἀese members are rich in organic matter and host pyrite which occurs as disseminations, small patches, and subparallel veins. ἀe sulfur isotope values of pyrite samples range between -7.5 and 0.5 ‰CDT (average = -3.5‰CDT). ἀe negative δ34S values are indicative of Bacterial Sulfate Reduction (BSR) under low temperature and euxinic/anoxic conditions. ἀe total organic carbon (TOC) values in this member ᴀuctuate between 0.5 and 2.1%. ἀese euxinic/anoxic conditions enhanced the incorporation of As and other trace elements in both organic matter and pyrite. ἀe As concentrations range from 13 to 800 mg/kg and from 1.4 to 34 mg/kg in pyrite and black shale samples, respectively. Rock Eval analyses reveal that organic matter is over-mature which altered the correlation between TOC and As. ἀe thermal cracking of organic matter resulted in the removal of these elements from organic matter and their subsequent incorporation in pyrite and bitumen. Organic matter- and pyrite-rich anoxic black shale layers and bitumen veins are potential sources of arsenic in groundwater in the Newark basin, with arsenic values that reach up to 215 μg/L.

Methyl mercury in zooplankton—the role of size, habitat, and food quality

2002 ◽  
Vol 59 (10) ◽  
pp. 1606-1615 ◽  
Author(s):  
Martin Kainz ◽  
Marc Lucotte ◽  
Christopher C Parrish
Keyword(s):  
Organic Matter ◽  
Fatty Acid ◽  
Body Size ◽  
Methyl Mercury ◽  
Size Fraction ◽  
Food Sources ◽  
Calanoid Copepods ◽  
Bacterial Food

Pathways of methyl mercury (MeHg) accumulation in zooplankton include ingestion of organic matter (OM). We analyzed fatty acid (FA) biomarkers in zooplankton to (i) investigate the effect of allochthonous and autochthonous OM ingestion on MeHg concentrations ([MeHg]) in zooplankton and (ii) examine how algal and bacterial food sources affect MeHg bioaccumulation. We partitioned bulk zooplankton samples (i.e., >500, 202, 100, and 53 μm) from Lake Lusignan (Québec) and measured [MeHg] and [FA] in each fraction. [MeHg] increased with increasing body size and was significantly higher in pelagic than in littoral macrozooplankton (>500 μm). The amount of the ingested terrestrial FA biomarker 24:0 indicated that less than 1% of the total FA in zooplankton was derived from allochthonous sources. More than 60% of the ingested FA originated from algal biomarkers and <10% from bacterial biomarkers. Relative amounts of algal-derived essential FA and bacterial FA were not associated with [MeHg] in any size fraction. In pelagic zones, the amount of MeHg in zooplankton related positively to the number of large organisms such as Calanoid copepods and Daphnia. We propose that the accumulation of MeHg in lacustrine zooplankton depends on the zooplankton habitat rather than on the quality of ingested food.

scholarly journals FORMATION OF OIL CONTENT IN OIL RADISH SEEDS DEPENDING ON APPLIED MICROELEMENTS

2020 ◽  
pp. 74-84
Author(s):  
Yaroslav Tsytsiura ◽  
Yurii Kovalchuk
Keyword(s):  
Trace Elements ◽  
Oil Content ◽  
Seed Quality ◽  
Reproductive Potential ◽  
Technical Direction ◽  
Oilseed Radish ◽  
The Family ◽  
Research Period

In the article the results of studying of features of role of trace elements in the formation of the quality indicators of seeds of oilseed radish in two varieties are reflected. Systematized the views of various researchers on the processes of formation of oil content in cruciferous crops in general and radish oilseed in particular, given the current strategy of fertilizer oilseed crops of the family Cruciferae. Studied feature of the stages of the implementation and effectiveness of mono-component micronutrients in the form of easily soluble and readily available substances. The studied set of microelements included the recommended list of physiologically important components of modern microfertilizer formats and their chemical composition in order to optimally analyze the effectiveness of application for their single application in two key phases of oilseed radish – the phenological phase of stalking and the phenological phase of flowering. The use of each of micronutrients was effective and substantial compared to the oil content of seeds of both cultivars of oilseed radish given the level of oil content in seeds in control variant. The magnitude of the variation in the oil index was estimated taking into account the differences in the nature of the hydrothermal regimes of the research period. This allowed to determine the degree of genotypic nature of the formation of the oil content of seeds in oilseed radish and the possibility and effectiveness of selection of appropriate genotypes with the prospect of obtaining oil in the technical direction of use. Also assessed the role of individual micronutrients in the magnitude of the volatility of oil content in seeds of oilseed radish. Determined that the increase of oil content in seeds of oilseed radish the addition of various trace elements in the range of 0.3-1.4% from the close dynamic the resulting effective action on the formation of this indicator in the form of Co>Zn>Cu>B>Mn>Mo. It is proved that the efficacy of these minerals increases with introducing them into the flowering stage, which is a critical period regarding the implementation of the reproductive potential of the plants of oilseed radish and the formation of appropriate indicators of the quality of its seeds. The recommendations for further research in the field of optimization of fertilizer radish seeds and micronutrients were formulated. Key words: oilseed radish, fertilizer, microelements, seed quality, oil content, variety.

Influence of humus acids on mobility and biological availability of iron, zinc and copper

2015 ◽  
Vol 2 (1) ◽  
pp. 73-78
Author(s):  
A. Fateev ◽  
D. Semenov ◽  
K. Smirnova ◽  
A. Shemet
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Acids ◽  
Fulvic Acids ◽  
Sand Culture ◽  
Humic And Fulvic Acids ◽  
Cultivation Medium ◽  
Mobile Forms

Soil organic matter is known as an important condition for the mobility of trace elements in soils, their geo- chemical migration and availability to plants. However, various components of soil organic matter have differ- ent effect on these processes due to their signifi cant differences in structure and properties. Aim. To establish the role of humic and fulvic acids in the process of formation of microelement mobility in soils and their accu- mulation in plants. Methods. A model experiment with sand culture was used to investigate the release of trace elements from preparations of humic and fulvic acids and their uptake by oat plants. Results. It was found that among biologically needed elements humic acids are enriched with iron, fulvic acids – with zinc, and copper distribution between these two groups of substances may be characterized as even. These elements have un- equal binding power with components of soil organic matter, as evidenced by their release into the cultivation medium and accumulation in plants. In the composition of fulvic acids zink has the most mobility – up to 95 % of this element is in the form, accessible for plants; the lowest mobility was demonstrated by copper in the composition with humic acids, for which no signifi cant changes in the concentration of mobile forms in the substrate and in the introduction to the test culture were registered. Despite signifi cantly higher iron content in humic acids, the application of fulvic acids in the cultivation medium provides a greater increase in the con- centration of mobile forms of this element. Conclusions. The results confi rm the important role of organic sub- stances of fulvic nature in the formation of zinc and iron mobility in the soil and their accumulation in plants.

scholarly journals Preliminary studies on some waste vegetable contribution to the soil fertility

2013 ◽  
Vol 24 (2) ◽  
pp. 127-130
Author(s):  
Elisabeta Chirila ◽  
Naliana Lupascu ◽  
Simona Raicu
Keyword(s):  
Organic Matter ◽  
Phosphorus Concentration ◽  
Available Phosphorus ◽  
Vegetable Waste ◽  
Fruit Waste ◽  
Before And After ◽  
Vegetable Wastes ◽  
Nitrogen Phosphorus

Abstract Researches on the use of waste vegetable (tomatoes, peppers) and fruits (apples, plums) in order to improve the nutritional quality of the soil have been performed. The content in nitrogen, phosphorus, potassium, humus, organic matter have been analyzed in fruits and vegetable waste and also in soil before and after mixing with each waste at a ratio of 1:2.5. Analyses were done by using current analytical methods (chemical and absorption molecular spectrometry) after previous mineralization of samples with appropriate reagents. To investigate the effect of vegetable wastes on the plants growth, wheat has been planted in the witness soil sample and in the mixed soil with wastes. The nutrients concentration in vegetable waste was higher than in fruit waste (33-75%). Available phosphorus concentration increased about two times in soil with fruit waste while in the soil with vegetable the increase was of about 3 times. Potassium concentration increased about three times in soil mixed with both types of waste. Although potassium and organic matter have higher values in the soil amended with fruit waste than in the witness soil, the height of the wheat was similar with those in the control soil due to the limiting role of phosphorus.

scholarly journals Aplikasi Pemupukan Organik dan Hayati di Sawah Kabupaten Tasikmalaya Jawa Barat

2019 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Reginawanti Hindersah ◽  
Sondi Kuswaryan
Keyword(s):  
Organic Matter ◽  
Community Service ◽  
Paddy Soil ◽  
Group Discussion ◽  
Paddy Fields ◽  
Plant Production ◽  
Basic Knowledge ◽  
Extension Program

ABSTRAKSebagian sawah di  Kecamatan Sukaratu, Kabupaten Tasikmalaya tertimbun material letusan Gunung Galunggung pada 1982 sehingga kualitas sawah tidak sebaik sebelum letusan. Peningkatan kualitas tanah sawah dapat dilakukan dengan bahan organik dan pupuk hayati. Tujuan Pengabdian kepada Masyarakat ini adalah memberikan pengetahuan dasar tentang pupuk hayati kepada petani di desa Sinagar dan Linggajati serta meningkatkan keterampilan petani dalam aplikasi pupuk hayati disertai kompos. Untuk mencapai tujuan tersebut, telah dilakukan diskusi kelompok terfokus dan penyuluhan mengenai pupuk hayati, praktek pembuatan kompos dan apliksi pupuk hayati konsorsium di sawah. Hasil kegiatan ini adalah 20 orang petani memahami  peran mikroba dan pupuk kotoran ternak serta komps dalam produksi tanaman; tetapi  mereka belum mampu membuat pupuk organik sesuai standard. Hanya satu orang petani yang mengaplikasikan pupuk hayati disertai penambahan kompos di tanah sawah sehingga meningkatkan produksi sebesar 1%.  Program ini memberikan gambaran bahwa teknologi pupuk hayati dapat diadopsi oleh petani di Kecamatan Sukaratu.Kata kunci: bahan Organik;  kotoran ternak; padi sawah; pupuk hayati.ABSTRACTSome of the paddy fields in Sukaratu Sub-district, Tasikmalaya Regency were buried by Mount Galunggung's eruption material in 1982 so that the quality of soil was worse than that before the eruption. Improving the quality of paddy soil can be established with biological fertilizers. The purpose of this community service was to introduce the basic knowledge about biofertilizer to farmers in the Sinagar and Linggajati Village; and to improve farmers' skills in the application of biological fertilizers and compost. To achieve the goals, we conducted a focused group discussion, short extension program on biological fertilizers, compost production, and consortium biofertilizer application in paddy fields. The result verified that 20 farmers has knowledge about the role of beneficial microbes, manure and compost for plant production but they did not able to prepare standardized organic matter. However one farmer was interested to apply biofertilizers along with compost to paddy fields. This program illustrates that biofertilizer technology can be adopted by farmer in Sukaratu Sub-district.Key Words: biofertilizer; cattle manure; organic matter; paddy soil

scholarly journals The influence of the quantity and quality of sediment organic matter on the potential mobility and toxicity of trace elements in bottom sediment

2019 ◽  
Vol 41 (6) ◽  
pp. 2893-2910 ◽  
Author(s):  
Agnieszka Baran ◽  
Monika Mierzwa-Hersztek ◽  
Krzysztof Gondek ◽  
Marek Tarnawski ◽  
Magdalena Szara ◽  
...  
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Bottom Sediment ◽  
Sediment Organic Matter ◽  
Potential Mobility
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