scholarly journals Distributions of total mercury and methylmercury in dragonflies from a large abandoned mercury mining region in China

2021 ◽  
Author(s):  
Gaoen Wu ◽  
Shunlin Tang ◽  
Jialiang Han ◽  
Chan Li ◽  
Lin Liu ◽  
...  
Keyword(s):  
Health Risk ◽  
Total Mercury ◽  
Nitrogen Isotope ◽  
Potential Health ◽  
Mining Region ◽  
Risk Of Exposure ◽  
Total Hg ◽  
Hg Mining ◽  
Mercury Mining ◽  
Pantala Flavescens

Abstract Dragonflies (Order Odonata) are often considered to be biosentinels of environmental contamination. Dragonflies (n = 439) belonging to 15 species of eight genera were collected from an abandoned mercury (Hg) mining region in China to investigate the bioaccumulation of total Hg (THg) and methylmercury (MeHg). The THg and MeHg concentrations in dragonflies varied widely within ranges of 0.06–19 mg/kg and 0.02–5.7 mg/kg, respectively. THg and MeHg were positively correlated with bodyweight (THg: r2 = 0.10, P = 0.000; MeHg: r2 = 0.09, P = 0.000). Significant variations were observed among species, with the highest MeHg value (in Orthetrum triangulare) being 5-fold higher than the lowest (in Pantala flavescens). These variations were consistent with those of nitrogen isotope (δ15N) values. A health risk assessment found hazard quotients for specialist dragonfly-consuming birds of up to 7.2, which is 2.4 times greater than the permissible limit of 3, suggesting a potential health risk of exposure.

Holistic health risk assessment in an artisanal mercury mining region in Mexico

2021 ◽  
Vol 193 (8) ◽  
Author(s):  
Arlette A. Camacho-delaCruz ◽  
Guillermo Espinosa-Reyes ◽  
Carlos A. Rebolloso-Hernández ◽  
Leticia Carrizales-Yáñez ◽  
César A. Ilizaliturri-Hernández ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Health Risk ◽  
Health Risk Assessment ◽  
Holistic Health ◽  
Mining Region ◽  
Mercury Mining

scholarly journals 278Sources and health risk of exposure to neonicotinoids in Chinese children: A biomonitoring-based stud

2021 ◽  
Vol 50 (Supplement_1) ◽  
Author(s):  
Hexing Wang ◽  
Dongjian Yang ◽  
Hongji Fang ◽  
Minghui Han ◽  
Chuanxi Tang ◽  
...  
Keyword(s):  
Health Risk ◽  
Tap Water ◽  
Hazard Quotient ◽  
Hazard Index ◽  
Chinese Children ◽  
Limited Data ◽  
Potential Health ◽  
Fresh Vegetables ◽  
Risk Of Exposure ◽  
Type Water

Abstract Background Recent studies have suggested an extensive exposure to neonicotinoids in human, but the sources and health risk of exposure to neonicotinoids remains little known in children. Methods After 309 school children were selected in 2019 from a dynamic child cohort established in Shanghai, East China, detailed data about basic information, intake of drinking water, and food consumption were collected and 12 typical neonicotinoids and metabolites were determined in morning urine. Sources of exposure to neonicotinoids were explored by binary/ordinal logistic regression model. Health risk was assessed by hazard quotient (HQ) and hazard index (HI). Results Except for imidaclothiz, thiacloprid, and 5-OH-imidacloprid, other six neonicotinoids and three metabolites were detected in 81.3% of urine samples overall. After adjusted for potential confounders, Thiamethoxam was more detected in children consuming more fresh vegetables (odds ratio (OR): 2.93, 95% confidence interval (CI): 1.21,7.14) and its subgroup (Chinese cabbage (OR: 2.00, 95%CI: 0.89,4.46) and nori and kelp (OR: 2.25, 95%CI:1.21,4.17)). Clothianidin showed a similar association with fresh vegetables and its subgroup to thiamethoxam. N-desmethyl-acetamiprid were detected in children drinking type water more (OR: 1.84, 95%CI: 1.10,3.06). The maximum HQ and HI were 0.3522 and 0.5187, respectively, and 2.8% of children had HIs between 0.1 and 1. Conclusions Tap water and fresh vegetables were potential exposure sources. A low health risk was posed on Chinese children by neonicotinoids. Given limited data about the adverse effects of neonicotinoids on human, sufficient attention should be paid to the exposure to these compounds and potential health effects. Key messages Tap water and fresh vegetables were exposure sources and a low health risk was posed on Chinese children by neonicotinoids.

ODOUR PROFILING FROM DECOMPOSITION OF LOCAL FOOD WASTE

2016 ◽  
Vol 78 (6-8) ◽  
Author(s):  
Siti Rohana Mohd Yatim ◽  
Ku Halim Ku Hamid ◽  
Kamariah Noor Ismail ◽  
Zulkifli Abdul Rashid
Keyword(s):  
Health Risk ◽  
Food Waste ◽  
Potential Risk ◽  
Local Food ◽  
Dimethyl Disulfide ◽  
Chemical Characteristics ◽  
Potential Health ◽  
Potential Health Risk ◽  
Physico Chemical ◽  
Risk Of Exposure

The aim of this study is to investigate odour emission profiles from storage of local food waste and to assess the potential health risk caused by exposure to volatile compounds. Food waste decomposition process was conducted for 14 days and kept at 20°C and 30°C in self-made bioreactor. VOCs emissions from both samples were collected at different stages of decomposition starting at day 0, day 1, day 3, day 5, day 7, day 10, day 12 and day 14. It was analyzed using TD-GC/MS. Findings showed that various VOCs were released during decomposition of food waste. Compounds produced were influenced by time, temperature and the physico-chemical characteristics of the compounds. The most abundant compound released was dimethyl disulfide. Potential health risk of exposure to this compound is represented by hazard ratio, HR, calculated at 1.6 x 1011. Since HR equal to or less than 1.0 is considered negligible risk, this indicates that the compound posed a potential risk to human health.

Occurrences of Giardia cysts in beach water

1998 ◽  
Vol 38 (12) ◽  
pp. 73-76 ◽  
Author(s):  
B. S. W. Ho ◽  
T.-Y Tam
Keyword(s):  
Health Risk ◽  
Water Sample ◽  
Water Samples ◽  
High Concentration ◽  
Potential Health ◽  
Infectious Dose ◽  
Potential Health Risk ◽  
E Coli ◽  
Beach Water ◽  
Giardia Cysts

A total of 64 beach water samples with various bacteriological quality (Grades 1 to 4) were analysed for their bacteriological and parasitological contents (E coli and Giardia cysts respectively). Results indicated that Giardia cysts were detected in less than 10% of the Grade 1 beach water samples with E coli concentrations of <24/100mL. For Grades 2, 3 & 4 beach water samples, Giardia cysts were found, respectively, in 85, 50 and 64% of the samples. Except for one beach water sample which had an unusually high concentration of Giardia cysts (23 cysts/L), they were generally present at moderate concentrations (<10 cysts/L) in all other beach water samples. Despite moderate levels of Giardia cysts present in beach water of different grades, the potential health risk faced by swimmers bathing in local beach water needs to be carefully assessed as Giardia is known to have a low infectious dose.

scholarly journals Effect of Industrial Wastewater on Fish in Karoon River

2015 ◽  
Vol 17 (1) ◽  
pp. 109-120
Author(s):  
Zahra Khoshnood ◽  
Reza Khoshnood
Keyword(s):  
Industrial Wastewater ◽  
Total Mercury ◽  
Anthropogenic Activities ◽  
Industrial Site ◽  
Hypophthalmichthys Molitrix ◽  
Karoon River ◽  
Muscle Tissues ◽  
Barbus Grypus ◽  
Standard Values ◽  
Total Hg

Abstract In 2009, 36 fish were sampled from two stations in the Karoon River near an industrial site. Two species of fish, Barbus grypus and Hypophthalmichthys molitrix were analyzed for total mercury (Hg) concentration in liver and muscle tissues. The average concentrations of total Hg in liver of B. grypus were 18.92 and 10.19 μg.g-1 in stations 1 and 2 respectively. The corresponding values for total Hg in edible muscle of Barbus grypus were 8.47 and 0.08 μg.g-1. The average concentrations of Hg in the liver of H. molitrix were 25.49 and 12.52 μg.g-1 in stations 1 and 2 respectively. The values for H. molitrix were 11.88 and 3.2 μg.g-1 in station 1 and station 2 respectively. The results showed that the bioavailability of Hg has increased considerably after industrialization and that these values were higher than the standard values as a result of anthropogenic activities in the region.

scholarly journals Silicon dioxide nanoparticles induced neurobehavioral impairments by disrupting microbiota–gut–brain axis

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Jun Diao ◽  
Yinyin Xia ◽  
Xuejun Jiang ◽  
Jingfu Qiu ◽  
Shuqun Cheng ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Health Risk ◽  
Silicon Dioxide ◽  
Spatial Learning And Memory ◽  
Rrna Gene ◽  
Silicon Dioxide Nanoparticles ◽  
Potential Health ◽  
Specific Chemical ◽  
Memory Impairments ◽  
Tissue Integrity

Abstract Background Silicon dioxide nanoparticles (SiO2NPs) are widely used as additive in the food industry with controversial health risk. Gut microbiota is a new and hot topic in the field of nanotoxicity. It also contributes a novel and insightful view to understand the potential health risk of food-grade SiO2NPs in children, who are susceptible to the toxic effects of nanoparticles. Methods In current study, the young mice were orally administrated with vehicle or SiO2NPs solution for 28 days. The effects of SiO2NPs on the gut microbiota were detected by 16S ribosomal RNA (rRNA) gene sequencing, and the neurobehavioral functions were evaluated by open field test and Morris water maze. The level of inflammation, tissue integrity of gut and the classical indicators involved in gut–brain, gut–liver and gut–lung axis were all assessed. Results Our results demonstrated that SiO2NPs significantly caused the spatial learning and memory impairments and locomotor inhibition. Although SiO2NPs did not trigger evident intestinal or neuronal inflammation, they remarkably damaged the tissue integrity. The microbial diversity within the gut was unexpectedly enhanced in SiO2NPs-treated mice, mainly manifested by the increased abundances of Firmicutes and Patescibacteria. Intriguingly, we demonstrated for the first time that the neurobehavioral impairments and brain damages induced by SiO2NPs might be distinctively associated with the disruption of gut–brain axis by specific chemical substances originated from gut, such as Vipr1 and Sstr2. Unapparent changes in liver or lung tissues further suggested the absence of gut–liver axis or gut–lung axis regulation upon oral SiO2NPs exposure. Conclusion This study provides a novel idea that the SiO2NPs induced neurotoxic effects may occur through distinctive gut–brain axis, showing no significant impact on either gut–lung axis or gut–liver axis. These findings raise the exciting prospect that maintenance and coordination of gastrointestinal functions may be critical for protection against the neurotoxicity of infant foodborne SiO2NPs.

Assessment of non-carcinogenic health risk of heavy metal pollution: evidences from coal mining region of eastern India

2021 ◽  
Author(s):  
Baisakhi Chakraborty ◽  
Biswajit Bera ◽  
Sambhunat`h Roy ◽  
Partha Pratim Adhikary ◽  
Debashish Sengupta ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Health Risk ◽  
Coal Mining ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Eastern India ◽  
Mining Region
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