COMPARISON OF A DRY ASH METHOD WITH PERCHLORIC ACID DIGESTION FOR TOTAL PHOSPHORUS ANALYSIS OF POND SEDIMENT

摘要

Two methods, perchloric acid digestion and dry ashing followed by acid extraction, were compared for liberating soil-bound phosphorus in preparation for analysis of total phosphorus in aquaculture pond sediment. Although there were differences in total phosphorus concentrations and estimates of precision between the methods, a high correlation was found between the two methods for both saline and non-saline samples. The dry ashing method is particularly suitable for use in laboratories without perchloric acid hoods, where the perchloric acid method cannot be safely conducted.