Veronika R. Meyer | Authors


Sampling: The Ghost in Front of the Laboratory Door

Sampling can be the most demanding part of an analysis. Anybody in charge of sampling needs a good understanding of the composition of the material to be investigated, its heterogeneity (or homogeneity, in simple cases), and the chemical properties of the analytes. Sampling procedures must be described in detail. Detecting the bias of a sampling procedure can be difficult; this fact is trivial, but it must not be forgotten.

Sampling: The Ghost in Front of the Laboratory Door

How does one meet the most demanding part of an analysis-sampling? A typical example is soil, which presents a twofold problem for the analyst: first, the selection of the sites where the samples are taken, and second, the reduction of a sample (for example, 1 kg) to the analysis aliquot size (for example, 10 μL). This paper describes the details of sampling issues.

The UV Detector for HPLC — An Ongoing Success Story

In this article, the authors look at the contemporary features of a UV detector and the design improvements that have been made over the last 30 years. Recommendations concerning technical details are also given that may influence the choice in purchase.