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Bulletin of Environmental Contamination and Toxicology

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https://www.readbyqxmd.com/read/29785648/ultrafiltration-for-the-determination-of-cu-complexed-with-dissolved-organic-matters-of-different-molecular-weight-from-a-eutrophic-river-china
#1
Anding Li, Yan Zhang, Beihai Zhou, Kailing Xin, Yingnan Gu, Weijie Xu, Jie Tian
The molecular weight of dissolved organic matter (DOM) is one of the essential factors controlling the properties of metal complexes. A continuous ultrafiltration experiment was designed to study the properties of Cu complexes with different molecular weights in a river before and after eutrophication. The results showed that the concentration of DOM increased from 26.47 to 38.20 mg/L during the eutrophication process, however, DOM was still dominated by the small molecular weight fraction before and after eutrophication...
May 21, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29785647/mrna-analysis-of-genes-encoded-with-phytochelatin-synthase-pcs-in-rice-seedlings-exposed-to-chromium-the-role-of-phytochelatins-in-cr-detoxification
#2
Xiao-Zhang Yu, Qin-Long Ling, Yan-Hong Li, Yu-Juan Lin
Transcriptional changes of genes encoded with phytochelatins synthase (PCS) was investigated in rice seedlings exposed to potassium chromate Cr(VI) or chromium nitrate Cr(III) using qRT-PCR. Our study demonstrates that both Cr variants initiated different responses of phytochelatin content and PCS activities in rice tissues. Six putative PCS genes were expressed differentially in response to both Cr species. Comparing gene expression between root/shoots, only LOC_Os05g34290.1 and LOC_Os06g01260.1 genes were expressed in similar patterns in Cr(VI) treatment, while none of them were expressed equally in Cr(III) treatments...
May 21, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29785646/investigating-the-spatial-trends-in-the-level-of-organic-contaminants-in-the-ethiopian-rift-valley-lakes-using-semipermeable-membrane-devices
#3
Ermias Deribe
Organic pollutants in the Ethiopian Rift Valley Lakes are the major factors that contribute to severe environmental problem. SPMDs were deployed for the analysis of selected organic pollutants for 1 month at 2 sites in Lakes Hawassa, Ziway and Koka, Ethiopia. From SPMDs placed in the three lakes, the predominant OCPs were DDT which comprise 67% and followed by endosulfan 23% of the total organochlorine pesticides (OCPs) retrieved. The highest level of OCPs, in general, was found in the SPMDs deployed in Lake Ziway with the mean concentration of 308...
May 21, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29779189/environmental-factors-determining-the-accumulation-of-metals-cu-zn-mn-and-fe-in-tissues-of-taraxacum-sp-sect-taraxacum
#4
Elżbieta Królak, Jolanta Marciniuk, Katarzyna Popijantus, Paulina Wasilczuk, Zbigniew Kasprzykowski
The genus Taraxacum is used in the assessment of soil contamination with heavy metals. There are relatively few studies using sections or species representing this genus. The presented research was conducted in Poland on two habitats, varied in terms of nutrients and metals content. The content of selected metals in leaves and roots of Taraxacum sect. Taraxacum was determined. It was found that in the conditions of increased content of metals in the soil, the analysed species representing sect. Taraxacum accumulate higher amounts of metals in their leaves and roots...
May 19, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29761304/metal-accumulation-strategies-of-emergent-plants-in-natural-wetland-ecosystems-contaminated-with-coke-oven-effluent
#5
Vivek Rana, Subodh Kumar Maiti
The release of industrial effluents into natural wetlands is a ubiquitous problem worldwide, and phytoremediation could be a viable option for treatment. The present study assessed metal accumulation strategies of three dominant emergent plants [Colocasia esculenta (L.) Schott, Scirpus grossus (L.) f., and Typha latifolia L.] growing in a wetland contaminated with coke-oven effluent. Metals concentration (mg kg-1 ) in wetland sediment followed the order Mn (408) > Cu (97) > Co (14.2) > Cr (14) > Cd (2...
May 14, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29754207/acute-toxicity-of-ammonia-nitrite-and-nitrate-to-shrimp-litopenaeus-vannamei-postlarvae-in-low-salinity-water
#6
Gladys Valencia-Castañeda, Martin G Frías-Espericueta, Ruth C Vanegas-Pérez, Jesús A Pérez-Ramírez, María C Chávez-Sánchez, Federico Páez-Osuna
Shrimp farming in low salinities waters is an alternative to increasing production, and counteracting disease problems in brackish and marine waters. However, in low-salinity waters, toxicity of nitrogen compounds increases, and there is no available data of its acute toxicity in shrimp postlarvae. This study determined the acute toxicity of ammonia, nitrite and nitrate in Litopenaeus vannamei postlarvae in 1 and 3 g/L salinity, as well as the safety levels. The LC50 confirms that nitrite is more toxic than ammonia and nitrate in low salinity waters, and that its toxicity increases with a decrease in salinity...
May 12, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29752519/potential-toxic-metal-accumulation-in-soil-forage-and-blood-plasma-of-buffaloes-sampled-from-jhang-pakistan
#7
Zafar Iqbal Khan, Ilker Ugulu, Sara Umar, Kafeel Ahmad, Naunain Mehmood, Asma Ashfaq, Humayun Bashir, Muhammad Sohail
This study was conducted to determine the concentration of toxic metals in soil, forage and blood plasma of lactating and non-lactating buffaloes in the district Jhang, Punjab, Pakistan. Soil samples were collected from varying distances from the road side. Plasma separation was achieved by centrifugation. The concentration of arsenic (As), selenium (Se), cadmium (Cd), chromium (Cr), iron (Fe), zinc (Zn), copper (Cu) and cobalt (Co) were determined by using Atomic Absorption Spectrophotometer. The results of the study showed that the mean As, Se and Cd concentrations in soil samples were lower while Cr, Fe, Zn, Cu and Co were higher than the official guidelines...
May 12, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29752518/diversity-of-the-aromatic-ring-hydroxylating-dioxygenases-in-the-monoaromatic-hydrocarbon-degraders-held-by-a-common-ancestor
#8
Alper Yavas, Bulent Icgen
Aromatic ring hydroxylating dioxygenases (ARHDs), harboured by a variety of bacteria, catalyze the initial reaction in the degradation of a wide range of toxic environmental contaminants like aromatic and polycyclic aromatic hydrocarbons (PAHs). Regardless of the source, bacteria harbouring RHDs play major role in the removal of these toxic contaminants. The diversity of ARHDs in contaminated sites is supposed to be huge. However, most of the ARHD diversity studies are based on the PAH degraders and the ARHD diversity in the monoaromatic hydrocarbon degraders has not fully explored yet...
May 11, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29744521/impact-of-heavy-metal-pollution-on-ammonia-oxidizers-in-soils-in-the-vicinity-of-a-tailings-dam-baotou-china
#9
Jumei Liu, Weiwei Cao, Haiming Jiang, Jing Cui, Chunfang Shi, Xiaohui Qiao, Ji Zhao, Wantong Si
Soil heavy metal pollution has received increasing attention due to their toxicity to soil microorganisms. We have analyzed the effects of heavy metal pollution on ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in soils in the vicinity of a tailings dam of Baotou region, China. Results showed that AOB were dominated with Nitrosomonas-like clusters, while AOA was dominated by group1.1b (Nitrososphaera cluster). Single Cd and Cr contents, as well as compound heavy metal pollution levels, had a significant negative impact on soil potential nitrification rate and both diversities of AOA and AOB...
May 9, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29744520/effects-of-low-frequency-ultrasound-on-microcystis-aeruginosa-from-cell-inactivation-to-disruption
#10
Xiao Tan, Xiaoqian Shu, Jiujia Guo, Keshab Parajuli, Xidong Zhang, Zhipeng Duan
Ultrasound can be used to induce cell resonance and cavitation to inhibit cyanobacterial growth, but it can also lead to increase in dissolved nutrients because of cell disruption. This study investigated the process from cell inactivation to disruption of Microcystis aeruginosa. Algal cells were sonicated (at 35 kHz) under various intensities and durations. Results showed that chlorophyll a content and F v /F m values decreased slightly within the first 5 min. Superoxide dismutase activity was stimulated and its peak value appeared at the fifth minute...
May 9, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29730715/effect-of-nitrogen-compounds-on-shrimp-litopenaeus-vannamei-histological-alterations-of-the-antennal-gland
#11
Marcela G Fregoso-López, María S Morales-Covarrubias, Miguel A Franco-Nava, Jesús T Ponce-Palafox, Juan F Fierro-Sañudo, Javier Ramírez-Rochín, Federico Páez-Osuna
Two experimental modules with different stocking densities (M1 = 70 and M2 = 120 shrimp m-2 ) were examined weekly during 72-day culture cycle at low-salinity water (1.9 g L-1 ) and zero-water exchange to examine the effects of water quality deterioration on the antennal gland (AG) of shrimp. Results showed survival rates of 87.7% and 11.9% in M1 and M2, respectively. Water temperature, pH, dissolved oxygen, and chlorophyll a were not significantly different between modules but the concentrations of the nitrogen compounds were significantly different between modules with the exception of nitrite-N, showing a higher histological alteration index in M2 (32 ± 10) than M1 (22 ± 0) with a strong correlation with the nitrogen compounds...
May 5, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29721597/brominated-flame-retardants-in-sediments-of-four-coastal-lagoons-of-yucatan-mexico
#12
I S Valenzuela-Sánchez, G Gold-Bouchot, E Hernández-Núñez, R C Barrientos-Medina, E Garza-Gisholt, O Zapata-Pérez
We examined the sediments of four coastal lagoons (Ria Lagartos, Bocas de Dzilam, Laguna de Chelem and Ria Celestun) from the state of Yucatan, Mexico, for three widely used commercial polybrominated diphenyl ethers formulations (penta-, octa- and deca-BDE). The most commonly found congeners in all four lagoons were BDEs 47, 99 and 100 (all in the penta-BDE formulation) and BDE209 (deca-BDE formulation). The greatest variety and highest concentrations of brominated flame retardants were found in Ria Lagartos, which also showed the highest BDE 100 concentration (24...
May 2, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29721596/contaminants-of-emerging-concern-in-wastewaters-in-barbados-west-indies
#13
Quincy A Edwards, Tamanna Sultana, Sergei M Kulikov, Leah D Garner-O'Neale, Viviane Yargeau, Chris D Metcalfe
There have been few reports in the peer-reviewed literature on the levels of contaminants of emerging concern (CECs) in municipal wastewater from the Caribbean region. In this study of wastewater collected from two wastewater treatment plants in Barbados, caffeine and ibuprofen were detected at µg/L concentrations, whereas two steroid hormones (i.e. androstenedione, estrone) and several prescription pharmaceuticals were detected at ng/L concentrations. Among drugs of abuse, benzoylecgonine (i.e. metabolite of cocaine), MDMA (i...
May 2, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29721595/pah-baselines-for-amazonic-surficial-sediments-a-case-of-study-in-guajar%C3%A3-bay-and-guam%C3%A3-river-northern-brazil
#14
Camila Carneiro Dos Santos Rodrigues, Ewerton Santos, Brunalisa Silva Ramos, Flaviana Cardoso Damasceno, José Augusto Martins Correa
The 16 priority PAH were determined in sediment samples from the insular zone of Guajará Bay and Guamá River (Southern Amazon River mouth). Low hydrocarbon levels were observed and naphthalene was the most representative PAH. The low molecular weight PAH represented 51% of the total PAH. Statistical analysis showed that the sampling sites are not significantly different. Source analysis by PAH ratios and principal component analysis revealed that PAH are primary from a few rate of fossil fuel combustion, mainly related to the local small community activity...
May 2, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29713751/bioaccumulation-and-distribution-of-hexabromocyclododecane-isomers-in-duck-tissues
#15
Wei Xia, Jianmei Wang, Hua Yang, Hu Zhang, Bo Yang, Yinhuan Zeng, Jie Xu, Zuguang Li, Mingrong Qian
Eighty ducks (Sheldrake, Anas platyrhynchos) from Zhejiang Province, China were fed capsules containing commercialized hexabromocyclododecanes (HBCDs) at low (0.8 mg/kg/day) or high (1.6 mg/kg/day) exposure level, or only maize starch for 21 days. Then the next 21 days was set as depuration period. Ducks were euthanizated at 0, 7, 14 and 21 days after last dose and ten duck tissues including skin, tongue, intestines, heart, gizzard, muscle, liver, lung, brain and blood were sampled, separately. Three HBCDs including α-HBCD, β-HBCD and γ-HBCD in duck tissue samples were analyzed...
April 30, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29704021/cytotoxic-assessment-of-chromium-and-arsenic-using-chromosomal-behavior-of-root-meristem-in-allium-cepa-l
#16
Kiran Gupta, Kumkum Mishra, Sudhakar Srivastava, Amit Kumar
A study was performed for phyto-genotoxic assay of chromium (Cr) and arsenic (As) through Allium cepa. Various concentrations (0, 1, 3, 6 and 12 mg L-1 ) of Cr and As for 48 and 168 h time points exposed to A. cepa. The phytotoxic effects of metal(loid) were evident through inhibited root length and root protein. Metal(loid) toxicity also lead to genotoxic effects, which included depression of mitotic index and increased frequency of chromosomes aberrations like break, fragments, c-metaphase, multipolar arrangements etc...
April 27, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29700581/toxicological-assessment-of-heavy-metal-bioaccumulation-and-oxidative-stress-biomarkers-in-clarias-gariepinus-from-igbokoda-river-of-south-western-nigeria
#17
Oluwatosin Adetola Arojojoye, Ademola Adetokunbo Oyagbemi, Jeremiah Moyinoluwalogo Afolabi
This study evaluated the environmental safety of Igbokoda River, a popular fishing hub in an oil producing area in Nigeria. Biomarkers of oxidative stress and heavy metals were determined in the liver and muscle of Clarias gariepinus from Igbokoda River and also in fish samples from a clean fish farm (control). Water samples from both sites were analysed for physicochemical parameters, heavy metals and bacterial contamination. There was significant increase in the level of heavy metals in water samples and in the organs of fish from Igbokoda River...
April 26, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29700580/temporal-variation-of-phthalic-acid-esters-paes-in-ambient-atmosphere-of-delhi
#18
Sarika Gupta, Ranu Gadi
Phthalic acid esters (PAEs) are a group of chemical species, ubiquitously present in the environment and pose a serious risk to humans. In the present study, the average concentrations of PAEs in PM10 (particulate matter ≤ 10 µm) are reported at a densely populated site in Delhi. The average concentration of PAEs was reported to be 703.1 ± 36.2 ng m-3 with slightly higher concentrations in winter than in summer; suggesting that sources are relatively stable over the whole year. The average concentration of PAEs was 35...
April 26, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29671016/atmospheric-co-2-level-and-temperature-affect-degradation-of-pretilachlor-and-butachlor-in-indian-soil
#19
Irani Mukherjee, Shaon Kumar Das, Aman Kumar
This study was conducted at ambient (398 ± 10 µmol mol-1 ), elevated (450 ± 10 µmol mol-1 ) and elevated (550 ± 10 µmol mol-1 ) atmospheric CO2 under three moisture regime and also three level of temperature (4, 25, and 40°C) to assess the degradation of pretilachlor and butachlor. Under dry condition at 398 ± 10 µmol mol-1 , T1/2 was 28.5 and 59.4 days for pretilachlor and butachlor, respectively; slowly decreased to 18.2 and 44.5 days at 550 ± 10 µmol mol-1 indicated that elevated condition enhanced degradation than ambient condition...
April 18, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29666898/citrus-epicarp-derived-biochar-reduced-cd-uptake-and-ameliorates-oxidative-stress-in-young-abelmoschus-esculentus-l-moench-okra-under-low-cd-stress
#20
Clement O Ogunkunle, Mayank Varun, Iyanuoluwa G Ogundele, Kehinde S Olorunmaiye, Manoj S Paul
Due to the important role of biochar (BC) in reducing metal-toxicity in plants, this study was aimed at assessing the potential of citrus epicarp-derived BC in ameliorating Cd toxicity in young Abelmoschus esculentus (okra) under low Cd toxicity. Okra was grown in soil amended with BC at four treatment levels for 49 days as follows: control (A), sole 1.4 mg Cd/kg-spiked soil (B), 1.4 mg Cd/kg-spiked soil + 1% BC (C) and 1.4 mg Cd/kg-spiked soil + 3% BC (D). The results showed a dose-dependent reduction in shoot accumulation of Cd due to the BC application...
April 17, 2018: Bulletin of Environmental Contamination and Toxicology
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