Monthly Archives: December 2011

Radioactive iodine level prompts drinking water, food warnings in Japan

Tokyo tap water “unfit” for babies…..210 Bq /L….

Refrain from eating vegetables such as cabbage, the “komatsuna” leaf vegetable, broccoli and cauliflower…..

Click here for news article….

Loss of distribution system pressure = boil water notice

As a precautionary measure, loss of pressure in the water distribution system typically results in a boil water notice…..because of the possibility of contamination due to backflow…..Click here or see below for recent example.

 

Martinez et al 2011: Arsenic Exposure and the Induction of Human Cancers

V.D. Martinez, E.A. Vuici, D.D. Becker-Santos, L. Gil, and W.L. Lam. Arsenic Exposure and the Induction of Human Cancers. J. Toxicol. 2011; doi. 10.1155/2011/431287

Figure 2.  Schematic representation of proposed arsenic-induced carcinogenic mechanisms. Arsenic can enter cells in both tri- or pentavalent forms (AsIII or AsV). Inside cells, AsV is converted to AsIII, with subsequent methylation to monomethylated (MMA) and dimethylated (DMA) species. The methylation of inorganic arsenic consumes both S-adenosylmethionine (SAM) and glutathione (GSH). Cellular damage derived from arsenic biotransformation can occur through generation of reactive oxygen species (ROS), and through epigenetic mechanisms: changes in DNA methylation patterns (by depletion of cellular pools of methyl group), histone modification, and altered expression of microRNAs (miRNAs).

Abstract: Arsenic is a metalloid, that is, considered to be a human carcinogen. Millions of individuals worldwide are chronically exposed through drinking water, with consequences ranging from acute toxicities to development of malignancies, such as skin and lung cancer. Despite well-known arsenic-related health effects, the molecular mechanisms involved are not fully understood; however, the arsenic biotransformation process, which includes methylation changes, is thought to play a key role. This paper explores the relationship of arsenic exposure with cancer development and summarizes current knowledge of the potential mechanisms that may contribute to the neoplastic processes observed in arsenic exposed human populations.

Click here for the full text of article (free).

Harlow and Spencer 2011: An inconvenient burden of proof? CO2 nuisance plaintiffs will face challenges in meeting the Daubert Standard

Click here or on image below for the full article (free) in the Energy Law Journal, Volume 32, No. 2 (2011):

Kim and Han 2011: Ingestion exposure to nitrosamines in chlorinated drinking water

H. Kim and K. Han. Ingestion exposure to nitrosamines in chlorinated drinking water. Environmental Health and Toxicology. 2011;26:e2011003.

Department of Environmental Science, College of Natural Sciences, Kangwon National University, Chuncheon, Korea.

OBJECTIVES: N-Nitrosodimethylamine (NDMA) is classified as a probable human carcinogen by the United States Environmental Protection Agency (US EPA) and is formed during the chlorination of municipal drinking water. In this study, selected nitrosamines were measured in chlorinated drinking water collected from Chuncheon, Kangwon-do, Republic of Korea, and a risk assessment for NDMA was conducted.

METHODS: Twelve water samples were collected from 2 treatment plants and 10 household taps. Samples were analyzed for 6 nitrosamines via solid-phase extraction cleanup followed by conversion to dansyl derivatives and high-performance liquid chromatography-fluorescence detection (HPLC-FLD). Considering the dietary patterns of Korean people and the concentration change of NDMA by boiling, a carcinogenic risk assessment from ingestion exposure was conducted following the US EPA guidelines.

RESULTS: NDMA concentrations ranged between 26.1 and 112.0 ng/L. NDMA in water was found to be thermally stable, and thus its concentration at the end of boiling was greater than before thermal treatment owing to the decrease in water volume. The estimated excess lifetime carcinogenic risk exceeded the regulatory baseline risk of 10(-5).

CONCLUSIONS: This result suggests that more extensive studies need to be conducted on nitrosamine concentration distributions over the country and the source of relatively high nitrosamine concentrations.

 

New York City to fix Delaware Aqueduct, only $2.1 billion

New York City proposes to fix 2.5 mile tunnel….only $2.1 billion…what a deal.

Source: silive.com

Click here for news coverage…..Click here for the NYC proposal.

Now, how about paying for that filtration plant?…..

USEPA violated laboratory requirements in testing Pavillion, Wyoming wells….

When a water or wastewater testing laboratory does not following the correct procedures….there are consequences to pay….

And now we find that the EPA laboratory could not even follow its own required procedures when sampling and testing water wells at Pavillion, Wyoming….click here…..