Part No: AN108-HORIssued year: 2016File size: 2.35mbFile type: pdf
Drinking water is a critical resource important for human health. As water becomes more scarce, quality will become increasingly important and monitoring will be required more frequently and at lower concentration levels. The number of compounds and lower concentrations for monitoring will make extraction and analysis even more challenging.
Part No: AN104-HORIssued year: 2016File size: 1.48mbFile type: pdf
Drinking water is an important resource that can provide significant exposure to humans if it is polluted. Analysis of source water, which may come from surface water, groundwater or treated water must be evaluated for possible contaminants to ensure regulatory compliance.1 Drinking water at the tap is often evaluated for contaminants that may be introduced through leaks in the pipes or pipe materials.
Part No: AN060-HORIssued year: 2010File size: 1.33mbFile type: pdf
This purpose of this study is to determine how the Directto- GC vial concentrator tube and the DryVap® Concentrator System can optimize the recoveries for both low and high boiling point semi-volatile compounds. A spiking mixture from EPA method 8270D was chosen due to the more volatile compounds in the mix that are difficult to retain during the concentration and subsequent rinsing process; while the higher boiling compounds are more likely to adsorb onto the glass walls.
Part No: AN107-HORIssued year: 2016File size: 1.59mbFile type: pdf
China has set ambitious goals for cleanup and monitoring of drinking water. Methods that are rugged and sensitive are required to support this effort. Chinese Environmental Agency method SL 392-2007 has been developed for this purpose and specifies a C18 cartridge for extraction and GC/MS for the detection step.
Part No: AN124-HORIssued year: 2017File size: 1.71mbFile type: pdf
Semivolatile organic compounds (SVOC) have a variety of chemical properties that have been found to cause harmful effects to both humans and the environment. Accurate measurements are challenging to obtain because SVOCs readily adsorb onto surfaces, and are found in common household items such as cleaning agents, personal care products, electrical components, pesticides, water and food.
Part No: AN106-HORIssued year: 2016File size: 1.4mbFile type: pdf
Worldwide, there is great concern for the presence of semi-volatile organic compounds in surface water, groundwater, and drinking water, such as Aldrin, extremely toxic to fish and a persistent organic pollutant. China has increased concern about drinking water as sources of surface and groundwater have become polluted with microbiological, metal and organic contamination
Part No: AN062-HORIssued year: 2011File size: 0.82mbFile type: pdf
Oftentimes, aqueous samples collected contain varying amounts of suspended solids or sediment strictly due to either the source of the water being sampled or improper sampling techniques. In any circumstance, samples with high amounts of particulates or sediment have proven challenging to extract using EPA Method 3535 Solid Phase Extraction (SPE).
Part No: AN069-HORIssued year: 2011File size: 0.79mbFile type: pdf
Laboratories which take in a high volume of aqueous samples will know that every sample is different. Samples can contain varying amounts of suspended particulates and/or sediment due to either the source of the water, or the collection technique. Still other samples may form precipitates under elevated pH conditions resulting in
emulsions. These types of samples have historically proven very challenging when using solid phase extraction (SPE).
Part No: AN066-HORIssued year: 2010File size: 1.39mbFile type: pdf
The extraction of samples for specialized liquid chromatography (LC) applications is frequently challenged by the need for a very particular solvent, or mix of solvents which are required to achieve the correct chromatography. These methods typically extract the analytes of interest into a water soluble solvent such as methanol and concentrate the extracts to total dryness before reconstituting the residue in another solvent. The evaporation step can be done using commercially available concentration apparatuses such as water baths or nitrogen gas sparging. However, these require constant analyst intervention to prevent the residue from being carbonized or otherwise thermally degraded.