Question

write a short note on how anne was as student ch 5 answer about 100-450 words​

Answer 1

Answer:

you should state the class also in this question......

Answer 2

Explanation:

This chapter presents collection and pretreatment samples for chromatographic analysis. The sampling and identification of contaminants in complex mixtures is one of the most important aspects of modern analytical chemistry of air pollutants. The recovery of trace amounts (up to 10-5mg/m3) of various chemical compounds from complex physico-chemical systems such as air is a difficult analytical problem. Qualitative changes in the composition of a processed sample may result from the use of high temperatures, the presence of oxygen and other oxidants, a considerable (1000-fold and more) increase in the concentration of all the components of a sample during the enrichment process, the presence of highly reactive, readily polymerizable or unstable compounds, etc. The use of sophisticated instrumentation, inert sorbents and highly effective columns in subsequent stages of the analysis cannot give accurate information if the sample was pretreated incorrectly. The most effective method of absorption of contaminants from air is the use of an absorber with a porous plate that increases the absorption of contaminants owing to the large surface area (small air bubbles) compared with the conventional design of an absorber.