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Posts Tagged ‘USGS’

USGS Study Finds Drinking Water Contaminated, but Safe to Drink

Tuesday, March 16th, 2010

Contaminated Drinking WaterA recent United States Geological Survey (USGS) study of public drinking water wells in California, Connecticut, Nebraska and Florida found that some were contaminated, but in amounts so minimal, human health was unlikely to be affected. The USGS tracked the movement of contaminants in groundwater and public-supply wells in four different aquifers.

According to the USGS, wells are not equally vulnerable to contamination because of differences in three factors: the general chemistry of the aquifer, groundwater age, and direct paths within aquifer systems that allow water and contaminants to reach a well. The importance of each factor differs among the various aquifer settings, depending upon natural geology and local aquifer conditions, as well as human activities related to land use and well construction and operation. However, the USGS feels that the study of the four different aquifer systems can be applied to similar aquifers and wells throughout the nation.

Read more about drinking water contamination…

Testing for PPCPs and EDCs in Your Water

Friday, March 14th, 2008

Wastewater discharged into waterwaysEvery day millions of gallons of treated and untreated wastewater are discharged into the waterways of the world. This wastewater may contain varying concentrations of pharmaceuticals and personal care products (PPCPs) including prescription and over the counter medications, nutraceuticals, illicit drugs, detergents, perfumes, insect repellent, sunscreens, and steroids, some of which have been identified in a recent article by The Associated Press1.

Recent studies have shown that many of these PPCP compounds at low concentrations can have negative effects on the endocrine systems of aquatic organisms. These compounds are collectively known as Endocrine Disrupting Compounds (EDCs). Other concerns regarding PPCPs include contamination of drinking water, estrogenic effects on humans and wildlife, and development of antibiotic resistant bacteria.


Emerging Chemicals of Concern for the Environment by SPE coupled with HPLC and HPLC/MS/MS Detection

Sunday, July 4th, 2004

Emerging Chemicals of Concern for the Environment by SPE coupled with HPLC and HPLC/MS/MS DetectionThe USGS has identified 95 organic wastewater contaminants (OWC’s) of concern (Kolpin et al. 2002). In this study, 80 percent of streams sampled contained measurable levels of OWC’s. This list consists of many new classes of organic compounds not amenable to the more common EPA GC and GC/MS standard analytical methods. These new classes of compounds include veterinary and human antibiotics, human drugs, industrial and household hazardous wastewater and multiple classes of hormones, which are generally larger and less volatile than analytes found on current EPA method lists. Reversed phase HPLC analysis with a polar mobile phase is particularly suitable to analyzing large molecules that exhibit low volatility. HPLC methods have been developed by Columbia Analytical Services in Kelso for the analysis of a wide range of these compounds utilizing UV and fluorescence detectors. Methods already developed include a number of estrogens and caffeine and its metabolites.