Biological acidification

Responses of Aquatic Organisms. The interactions between aquatic organisms and the chemistry of their water habitats are extremely complex. If a species or a group of species increases or declines in numbers in response to acidification, then the biological structure of the entire water body is likely to be affected. Reactions of organisms to stress such as acidification can be termed a "dose-response" reaction (i.e. a certain dose of acidifying pollutant induces a certain response). 

Recently, most of the methods which have been used for the analysis of valproic acid in plasma, serum, cerebral spinal fluid, saliva, breast milk, and urine involve acidification of the biological sample, extraction into an organic solvent, and direct injection onto a gas-liquid chromatographic column (28, 29, 16, 30, 31, 32,... 

Another pre-treatment often used to prevent biological degradation of organic contaminants in water is acidification with sulfuric acid to pH <3 [4], The change in concentrations of NPEO, AEOs and PEGs in spiked groundwater (500 p,gL 1) and in wastewater treatment plant (WWTP) influent preserved by addition of formaline (1 and 3%, v/v) and by acidification to pH 3 with sulfuric acid and kept for 30 days at 4°C are shown in Table 4.4.1. 

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