SEGH Articles

Arsenic Biogeochemistry and Health

04 November 2014
The success of the 29th SEGH conference produced a special issue of papers presenting recent advances in various aspects of environmental and health impacts of contaminants, published in Environmental Geochemistry and Health

 

The 29th international Conference for Environmental Geochemistry and Health was held in Toulouse, France, from July 8th to 12th 2013 (http://segh2013.sciencesconf.org/). This annual meeting of the SEGH brought together 160 scientists from 35 countries to exchange ideas and results about regular topics (Biogeochemistry and Health, Biogeochemistry and Ecotoxicology, Spatial and Temporal Records of Pollution including Catchment Studies), as well as in Special Sessions (Frontiers in Mercury Biogeochemistry, Bioaccessibility of Pollutants in Soils and Vegetables, Arsenic: Current Issues of Speciation, Environmental Behaviour and Human Health Impacts). The participants had the occasion to present their work as well as learn from colleagues during three days of parallel sessions and outdoor poster sessions under the warm sun of Toulouse.


The success of this 29th event had several outcomes in the form of special issues. The first special issue was a collection of thirteen original papers presenting recent advances in various aspects of environmental and health impacts of contaminants, published in Environmental Geochemistry and Health, the SEGH Journal (http://link.springer.com/journal/10653/36/5/page/1). All the SEGH members have free access to this journal. A second special issue, published in Environmental Chemistry, grouped papers presented in one of the three special sessions, which was dealing with arsenic biogeochemistry and health, as well as the state of the art works in arsenic research (http://www.publish.csiro.au/nid/188/OnlineEarlyFlag/1.htm).

We encourage the SEGH members to take a closer look at these two special issues as well as to participate in future SEGH events and submit papers to our journals!

On behalf of the 29th SEGH conference organising committee as well as the guest editors of these two special issues, we warmly thank all the contributors for their valuable inputs.


Francois De Vleeschouwer & Kevin Francesconi. 

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Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health

  • Improving arsenopyrite oxidation rate laws: implications for arsenic mobilization during aquifer storage and recovery (ASR) 2018-04-25

    Abstract

    Aquifer storage and recovery (ASR) and aquifer recharge (AR) provide technical solutions to address water supply deficits and growing future water demands. Unfortunately, the mobilization of naturally present arsenic due to ASR/AR operations has undermined its application on a larger scale. Predicting arsenic mobility in the subsurface during ASR/AR is further complicated by site-specific factors, including the arsenic mobilization mechanisms, groundwater flow conditions, and multi-phase geochemical interactions. In order to ensure safe and sustainable ASR/AR operation, a better understanding of these factors is needed. The current study thus aims to better characterize and model arsenic remobilization at ASR/AR sites by compiling and analyzing available kinetic data on arsenic mobilization from arsenopyrite under different aqueous conditions. More robust and widely applicable rate laws are developed for geochemical conditions relevant to ASR/AR. Sensitivity analysis of these new rate laws gives further insight into the controlling geochemical factors for arsenic mobilization. When improved rate laws are incorporated as the inputs for reactive transport modeling, arsenic mobilization in ASR/AR operations can be predicted with an improved accuracy. The outcomes will be used to guide groundwater monitoring and specify ASR/AR operational parameters, including water pretreatment requirements prior to injection.

  • Heavy metal exposure has adverse effects on the growth and development of preschool children 2018-04-25

    Abstract

    The purpose of this study was to investigate the associations between levels of lead (Pb), cadmium (Cd), chromium (Cr), and manganese (Mn) in the PM2.5 and blood and physical growth, and development parameters including birth length and weight, height, weight, body mass index (BMI), head circumference, and chest circumference in preschool children from Guiyu (e-waste exposure area) and Haojiang (the reference area). A total of 470 preschool children from Guiyu and Haojiang located in southeast coast of China were recruited and required to undergo physical examination and blood tests during the study period. Birth length and weight were obtained by birth records and questionnaire. Pb and Cd in both PM2.5 and blood were significantly higher in Guiyu than Haojiang. Remarkably, the children of Guiyu had significantly lower birth weight and length, BMI, and chest circumference when compare to their peers from the reference area (all p value < 0.05). Spearman correlation analyses showed that blood Pb was negatively correlated with height (r = −0.130, p < 0.001), weight (r = −0.169, p < 0.001), BMI (r = −0.100, p < 0.05), head circumference (r = −0.095, p < 0.05), and chest circumference (r = −0.112, p < 0.05). After adjustment for the potential confounders in further linear regression analyses, blood Pb was negatively associated with height (β = −0.066, p < 0.05), weight (β = −0.119, p < 0.001), head circumference (β = −0.123, p < 0.01), and chest circumference (β = −0.104, p < 0.05), respectively. No significant association between blood Cd, Cr, or Mn was found with any of our developmental outcomes. Taken together, lead exposure limits or delays the growth and development of preschool children.

  • Contamination characteristics of trace metals in dust from different levels of roads of a heavily air-polluted city in north China 2018-04-24

    Abstract

    Concentrations of eight trace metals (TMs) in road dust (RD) (particles < 25 μm) from urban areas of Xinxiang, China, were determined by inductively coupled plasma mass spectrometry. The geometric mean concentrations of Zn, Mn, Pb, As, Cu, Cr, Ni and Cd were 489, 350, 114, 101, 60.0, 39.7, 31.6, and 5.1 mg kg−1, respectively. When compared with TM levels in background soil, the samples generally display elevated TM concentrations, except for Cr and Mn, and for Cd the enrichment value was 69.6. Spatial variations indicated TMs in RD from park path would have similar sources with main roads, collector streets and bypasses. Average daily exposure doses of the studied TMs were about three orders of magnitude higher for hand-to-mouth ingestion than dermal contact, and the exposure doses for children were 9.33 times higher than that for adults. The decreasing trend of calculated hazard indexes (HI) for the eight elements was As > Pb > Cr > Mn > Cd > Zn > Ni > Cu for both children and adults.