US EPA Method 8270D specifies a procedure for the determination of semivolatiles in solid waste and ground water samples. The long list of analytes includes compounds of a variety of functionalities. A 0.25 μm df column is commonly used for this method, as it will allow for a short analysis time. However, the thin phase film of this dimension limits its sample capacity. An alternative choice is a 0.50 μm df column, which can accommodate higher concentrations and thus extend the calibration range.
Calcium, Magnesium and Total Hardness Determination by Potentiometric Titration Using TRIS Buffer
Scope and Application
This method is useful for monitoring the calcium, magnesium and total hardness in water samples. It is a variation of Standard Method 2340C and ASTM D-1126.
Hardness analysis typically involved the addition of an ammonium hydroxide buffer to a water sample prior to titration. The traditional buffer is caustic and causes a shocking effect on the pH electrode. It also has an undesirable odor....
Customer: Con-Test Analytical Laboratories, USACon-Test Analytical Laboratory provides environmental and hygiene analytical services with the capability of analyzing nearly all water, air, soil, and solid materials.Application: US EPA 608US EPA Method 608 covers the determination of certain organochlorine pesticides found in industrial waste water. The sample is first extracted with methylene chloride, concentrated to 1 mL and analyzed by GC/MS instrumentation. The concentration step is paramount and must be done...
On September 29, 2017, the U.S. Environmental Protection Agency (EPA) announced the availability of two final test method Standard Operating Procedures (SOP) for evaluating the efficacy of antimicrobials against spores of Clostridium difficile (C. diff):
EPA Microbiology Laboratory Branch (MLB) SOP MB-28: Procedure for the Production and Storage of Spores of Clostridium difficile for Use in the Efficacy Evaluation of Antimicrobial Agents; and
EPA MLB SOP MB-31: Procedure for the OECD Quantitative Method...
The USEPA Clean Water Act (CWA) requires national approval for all methods used for CWA compliance. There are approved methods for the determination of inorganic nitrogen (NO3-N, NO2-N, and NH3-N), and for organic nitrogen (TKN – NH3-N)2. There are no EPA approved methods for the determination of total nitrogen although it is a required parameter in many USEPA permits, including monitoring of nutrient pollution for ambient water criteria. Because Part 136.3 Table 1b methods are required, laboratories have...
This application note describes the methodology and use of the Shimadzu ICPMS-2030 ICP mass spectrometer for the analysis of trace elements in drinking and fresh waters following the EPA 200.8 method. This method is also used for analysis of wastewater. In-line addition of internal standards to calibration and unknown samples was accomplished using the Shimadzu Internal Standard Addition Kit. Based on the internal diameter of peristaltic tubing used for sample and internal standard injection, the approximate...
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