Application of total phosphorus sequential injection system in Qingdao coastal area

Abstract

Abstract An integrated system was developed for automatic determination of total phosphorus in seawater based on sequential injection analysis combined with spectrophotometric detection. The experimental parameters of digestion were optimized based on a univariate experimental design. The upper limit of the linear range of the proposed method was 1000 μg/L. The relative standard deviations (RSDs) of accuray were below ±2% (n=3) and the RSD of presicion was 2.18% (n=6). This system has been successfully applied to determine total phosphorus in Qingdao Coastal area. The F test and t test implied the results of the system had no evident difference with those detected by nutrient flow analyzer in the laboratory.