Daily Archives: January 23, 2012

Federal Regulatory Agenda posted….

Click here or the image below to access the most recent federal regulatory agenda….

Portland (OR) Bull Run watershed polluted by suspended solids….

Wells are now being used in Portland, Oregon. Heavy rains and increased streamflows have resulted in pollution by turbidity and suspended solids….

Gee, a good filtration plant could easily treat this water…..click here….

Thailand water reservoir levels now higher than 2011…

With the rainy season starting in May, the current high water levels in the country’s water storage reservoirs have many worried about future flooding…..click here….. 

Kim et al 2011: Arsenic geochemistry of groundwater in Southeast Asia

Kim, K.W., P. Chanpiwat, H.T. Hanh, K. Phan, and S. Sthiannopkao. Arsenic geochemistry of groundwater in Southeast Asia. Front Med. 2011 Dec;5(4):420-33. Epub 2011 Dec 27.

School of Environmental Science & Engineering and International Environmental Analysis & Education Center (IEAEC), Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, South Korea, kwkim@gist.ac.kr

Abstract: The occurrence of high concentrations of arsenic in the groundwater of the Southeast Asia region has received much attention in the past decade. This study presents an overview of the arsenic contamination problems in Vietnam, Cambodia, Lao People’s Democratic Republic and Thailand. Most groundwater used as a source of drinking water in rural areas has been found to be contaminated with arsenic exceeding the WHO drinking water guideline of 10 μg·L(-1). With the exception of Thailand, groundwater was found to be contaminated with naturally occurring arsenic in the region. Interestingly, high arsenic concentrations (> 10 μg·L(-1)) were generally found in the floodplain areas located along the Mekong River. The source of elevated arsenic concentrations in groundwater is thought to be the release of arsenic from river sediments under highly reducing conditions. In Thailand, arsenic has never been found naturally in groundwater, but originates from tin mining activities. More than 10 million residents in Southeast Asia are estimated to be at risk from consuming arsenic-contaminated groundwater. In Southeast Asia, groundwater has been found to be a significant source of daily inorganic arsenic intake in humans. A positive correlation between groundwater arsenic concentration and arsenic concentration in human hair has been observed in Cambodia and Vietnam. A substantial knowledge gap exists between the epidemiology of arsenicosis and its impact on human health. More collaborative studies particularly on the scope of public health and its epidemiology are needed to conduct to fulfill the knowledge gaps of As as well as to enhance the operational responses to As issue in Southeast Asian countries.