Managing Heterogeneity with Incremental Sampling Methodology
November 1st 2017Incremental sampling methodology laboratory processing is used to produce an appropriately sized subsample that has the analytes of interest at the same concentration as the large incremental sample collected in the field. The end goal is to produce results that represent the conditions at the site and facilitate good decisions.
34 Years of LC Troubleshooting: An Interview with John Dolan
November 1st 2017Dwight Stoll, the new editor of “LC Troubleshooting,” asks John Dolan about the current state of chromatography training, John’s toughest troubleshooting challenge, the most common chromatographic mistakes, and what he foresees for the future.
Managing Heterogeneity with Incremental Sampling Methodology
November 1st 2017Perhaps the largest source of error with sampling and sample preparation, especially with solid and semisolid samples, is the sample heterogeneity. Generally, sample heterogeneity is managed by sample homogenization, such as grinding and mixing, as well as use of an appropriately large sample size. Incremental sampling methodology (ISM) involves structured composite sampling and a processing method to create an unbiased estimate of the mean concentration of soil contaminants. Hence, ISM is emerging as a preferred methodology for conducting field environmental sampling. In this month’s instalment of “Sample Preparation Perspectives”, we describe the application of ISM to laboratory subsampling protocols.
New Mass Screening Approach for Algal Blooms
October 24th 2017Researchers from The First Institute of Oceanography in Qingdao, China, have developed an exact mass suspect screening approach for identifying multiple lipophilic marine toxins in seawater, suspended particulate matter (SPM), and marine sediment using LC–TOF-MS.