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 Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.

Improved groundwater geogenic arsenic hazard map for Cambodia

Chansopheaktra Sovann, David Polya


Arsenic is a known environmental chemical hazard in shallow groundwaters of Cambodia and is increasingly recognised as a major problem for public health. Notwithstanding this, accurate arsenic data are not available for many wells in potentially arsenic-prone areas, particularly around the Tonle Sap Great Lake (TSL) and in the coastal provinces (CP). We present here new data for shallow groundwater (16 – 120 m depth) arsenic in the TSL and CP regions as well as an improved regression-kriging (RK) based groundwater arsenic hazard map for the whole country. High arsenic (up to 100 μg/L) was found in shallow groundwaters from the TSL and CP regions of Cambodia, but despite strong compositional similarities (near neutral, reducing, Na-Mg-Ca-HCO3 dominated) with high arsenic groundwaters near the Mekong and Bassac rivers, groundwater arsenic in both the TSL and CP regions were most commonly low (interquartile range 0.09 – 1.2 μg/L). The RK geostatistical model was highly successful, accounting for over 50 % of the observed variation in arsenic concentrations countrywide and represents a potentially useful tool for policymakers and those responsible and with the interest and authority to prepare arsenic mitigation and safe water supply plans.

EN14006  Accepted 25 May 2014
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