Crystallography

Arsenic Exposure and Health Effects IV : Fourth by W R Chappell; C O Abernathy; R L Calderon PDF

By W R Chappell; C O Abernathy; R L Calderon

ISBN-10: 0080523056

ISBN-13: 9780080523057

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Additional info for Arsenic Exposure and Health Effects IV : Fourth International Conference on Arsenic Exposure and Health Effects, 18-22 July, 2000, San Diego, USA

Sample text

All the aquifers are relatively young (Quaternary, many Holocene) and groundwater flow is in each known to be relatively sluggish as a result of various combinations of factors such as arid conditions, low recharge rates, low hydraulic gradients and poorly permeable sediments. Lack of aquifer flushing over the short history (of the order of a few thousand years) of the aquifers is therefore thought to have been important to the generation of groundwater As problems, as there will have been less possibility of removal of As and other trace elements from the aquifer.

If oxidation of pyrite is the source of arsenic in groundwater then there are two questions to be answered: (a) whether arsenic-rich pyrite is sufficient to account for the mass of arsenic mobilized in groundwater; and (b) whether increased pyrite oxidation has led to increased arsenic and sulfate concentrations. Ore microscopic examination using reflected light indicates abundant highly reflective opaque particles, suggesting the presence of sulfide minerals. 36 wt%. Gypsum may be a product of oxidation of sulfur in pyrite to sulfate followed by dissolution to calcite common to borehole samples studied.

5 n 103 108 108 102 106 108 108 108 108 108 108 108 108 108 108 108 108 108 108 108 108 108 108 108 108 107 34 107 107 34 Abbreviations as for Table 1. Concentrations of dissolved AsT range between <4 and 5280 µg l 1 (median 149 µg l 1 ; mean 414 µg l 1 ). Of the dissolved As present, measured As(III) concentrations form a very small proportion of the total, indicating that the dominant species is As(V). 06 (Fig. 8). The concentrations of AsT are generally positively correlated with pH and alkalinity (Fig.

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Arsenic Exposure and Health Effects IV : Fourth International Conference on Arsenic Exposure and Health Effects, 18-22 July, 2000, San Diego, USA by W R Chappell; C O Abernathy; R L Calderon


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