04 July 2016
ISEH 2016 & Geoinformatics 2016: Joint International Conference on Environment, Health, GIS and Agriculture
14 August 2016
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Science in the News
Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health
- Assessment of arsenic (As) occurrence in arable soil and its related health risk in China 2016-06-01
Arsenic (As) is a major global environmental pollutant due to its high toxicity on human and animal health. This study collected 427 relevant papers to study As concentrations in Chinese arable soil and evaluate the health risk of exposure to As for humans. Results showed that the average of As concentration was 9.46Â mg/kg in Chinese arable soil. Soil As concentrations in Hunan Province and Guangxi Zhuang Autonomous Region posed high carcinogenic and non-cancer risks on human health through diet, Yunnan, Guizhou, Guangdong, and Xinjiang provinces had relative high health risks, while As concentrations in the other provinces posed low health risks on humans. The physical factors controlled the spatial pattern of health risk on a provincial scale, but the As-related human activities introduced high health risk on people, particularly the agricultural activities such as sewage irrigation and fertilizer application should be given more attention due to its large area.
- Mercury distribution in organs of fish species and the associated risk in traditional subsistence villagers of the Pantanal wetland 2016-06-01
This study evaluated the risk to human health from mercury (Hg) exposure through fish consumption in the Pantanal, Brazil. In order to address these risks, Hg concentrations and accumulation patterns were determined in target organs of predatory fish (Crenicichla lepidota and Pygocentrus nattereri). Levels of Hg were analysed during the two phases of the flood pulse (flood and drought) in fish from different local ecosystems, such as the Bento Gomes and Paraguay rivers. Although the former study area is directly affected by gold mining, a higher, but not significantly different, Hg concentration in fish was found compared with fish at the Paraguay River, which is regarded as pristine area. Moreover, no seasonal variability was found in either river. Although total mercury levels in fish did not exceed the maximum FAO/WHO threshold (0.5Â ÎŒgÂ gâ1), according to dietary habits in riverine communities of the Pantanal (up to 6Â oz of fish per day), there is reason for concern over the potential for deleterious health effects that could be caused by high Hg intake. In fact, the estimated daily intake in the present study ranged from 0.49 to 1.08Â ÎŒgÂ HgÂ kgâ1Â dayâ1, for adults (including women of childbearing age) and children, respectively. Because of high Hg intakes in riverine groups, which exceed the recommended reference dose value, these communities could be considered at risk. Therefore, it is necessary to consider regulatory measures and public education regarding fish consumption, particularly in vulnerable groups (i.e. children, pregnant women and women of childbearing age).
- Current status of arsenic exposure and social implication in the Mekong River basin of Cambodia 2016-06-01
To evaluate the current status of arsenic exposure in the Mekong River basin of Cambodia, field interview along with urine sample collection was conducted in the arsenic-affected area of Kandal Province, Cambodia. Urine samples were analyzed for total arsenic concentrations by inductively coupled plasma mass spectrometry. As a result, arsenicosis patients (nÂ =Â 127) had As in urine (UAs) ranging from 3.76 to 373Â Â”gÂ Lâ1 (meanÂ =Â 78.7Â Â±Â 69.8Â Â”gÂ Lâ1; medianÂ =Â 60.2Â Â”gÂ Lâ1). Asymptomatic villagers (nÂ =Â 108) had UAs ranging from 5.93 to 312Â Â”gÂ Lâ1 (meanÂ =Â 73.0Â Â±Â 52.2Â Â”gÂ Lâ1; medianÂ =Â 60.5Â Â”gÂ Lâ1). About 24.7Â % of all participants had UAs greater than 100Â Â”gÂ Lâ1 which indicated a recent arsenic exposure. A survey found that females and adults were more likely to be diagnosed with skin sign of arsenicosis than males and children, respectively. Education level, age, gender, groundwater drinking period, residence time in the village and amount of water drunk per day may influence the incidence of skin signs of arsenicosis. This study suggests that residents in Kandal study area are currently at risk of arsenic although some mitigation has been implemented. More commitment should be made to address this public health concern in rural Cambodia.