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Preparation of standard reference material for reactive phosphorus with seawater matrix
ZHANG Chuan, YU Tao, YU Xiaoyan, ZHU Yong, WANG Lifang, ZHANG Xiaohui
Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (3) : 92-100.
PDF(1519 KB)
PDF(1519 KB)
Preparation of standard reference material for reactive phosphorus with seawater matrix
Based on Western Pacific surface seawater as matrix, a series of reactive phosphorus reference materials with the concentration of 0.5-4.0 μmol/L were prepared. By investigating the uniformity and stability of the 4 batches of samples, it was confirmed that the performance met the needs of requirements. For the determination of reactive phosphorus in aqueous sample, segmented continuous flow analysis system with UV detector was used. The experimental conditions were optimized, the limit of detection(LOD) of the method was 0.03 μmol/L, and the relative standard deviation (RSD) of 4 different concentration batches was 0.37%-2.45%. The reliability of the method was verified by testing a CRM. The error was not more than 0.05 μmol/L. The concentration standard value of the series of reference substances was determined by 6 laboratories, and the relative expended uncertainty of characterization was evaluated, which was 2%-10%.
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