Daily Archives: November 11, 2011

Santa Clara Valley Water District (CA) to consider fluoridation

San Jose, California is the largest city in the US with out fluoridated drinking water. The Santa Clara Valley Water District’s 7-member board will vote on whether to put the agency on record for the first time supporting fluoridation. If approved, they will still have to figure out how to pay for the project, which could take years.

Click here for the news article.

Press Spin: Schwartzwalder mine recycled story line

When the news cycle is slow, the old reliabe stroy lines are published again, and again, and again. In this case it is the Denver Post (voice of the Colorado Democrats) recycling the Schwartzwalder mine situation (click here)….certainly a situation that needs fixing…..but whining Colorado regulators and board newspaper writers can not do much about it…..other than political posturing….

Penn State University President fired, but not for climategate fallout

The unfortunate situation at the football program at the Pennsylvania State University has resulted in the firing of Graham Spanier as University President. Perhaps this action was long-overdue, since the superficial climategate email investigations also appear to have been covered up…..click here.

Liu et al 2011: Formation of disinfection byproducts in typical Chinese drinking water.

W. Liu, Y.Zhao, C.W. Chow, and D. Wang. Formation of disinfection byproducts in typical Chinese drinking water. Journal of Environmental Science (China). 2011;23(6):897-903.

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. bobo.311@163.com

Eight typical drinking water supplies in China were selected in this study. Both source and tap water were used to investigate the occurrence of chlorinated disinfection byproducts (DBPs), and seasonal variation in the concentrations of trihalomethanes (THMs) of seven water sources was compared. The results showed that the pollution level for source water in China, as shown by DBP formation potential, was low. The most encountered DBPs were chloroform, dichloroacetic acid, trichloroacetic acid, and chlorodibromoacetic acid. The concentration of every THMs and haloacetic acid (HAA) compound was under the limit of standards for drinking water quality. The highest total THMs concentrations were detected in spring.

Bedoux et al 2011: Occurrence and toxicity of antimicrobial triclosan and by-products in the environment

G.Bedoux, B. Roig, O. Thomas, V. Dupont, and B. LeBot.  Occurrence and toxicity of antimicrobial triclosan and by-products in the environment. Environ Sci Pollut Res Int. 2011 Nov 5.

INTRODUCTION AND AIMS:  A review was undertaken on the occurrence, toxicity, and degradation of triclosan (TCS; 5-chloro-2,4-dichlorophenoxy)phenol) in the environment. TCS is a synthetic, broad-spectrum antibacterial agent incorporated in a wide variety of household and personal care products such as hand soap, toothpaste, and deodorants but also in textile fibers used in a range of other consumer products (e.g., toys, undergarments and cutting boards among other things).

OCCURRENCE: Because of its partial elimination in sewage treatment plants, most reports describe TCS as one of the most commonly encountered substances in solid and water environmental compartments. It has been detected in a microgram per liter or microgram per kilogram level in sewage treatment plants (influents, effluents, and sludges), natural waters (rivers, lakes, and estuarine waters), and sediments as well as in drinking water.

TOXICITY: Moreover, due to its high hydrophobicity, TCS can accumulate in fatty tissues and has been found in fish and human samples (urine, breast milk, and serum). TCS is known to be biodegradable, photo-unstable, and reactive towards chlorine and ozone.

DISCUSSION: As a consequence, it can be transformed into potentially more toxic and persistent compounds, such as chlorinated phenols and biphenyl ethers after chlorination, methyl triclosan after biological methylation, and chlorinated dibenzodioxins after photooxidation. The toxicity of TCS toward aquatic organisms like fish, crustaceans, and algae has been demonstrated with EC50 values near TCS environmental concentrations. It has even been shown to produce cytotoxic, genotoxic, and endocrine disruptor effects.

CONCLUSION: Furthermore, the excessive use of TCS is suspected to increase the risk of emergence of TCS-resistant bacteria and the selection of resistant strains.

Click here for the full paper (free).