Determination of seven plant nutritional elements in potassium dihydrogen phosphate fertilizer from northeastern China

Abstract EN

Contents of seven plant nutritional elements in potassium dihydrogen phosphate fertilizer were determined by ICP-MS.

Correlation coefficients of the detected elements changed between 0.9631 and 0.9999, the limits of detection range from 0.18 to 0.77 lg / L, and relative standard deviations range from 1.17% to 3.82% for all the elements, ICP-MS (Inductively Coupled Plasma-Mass Spectrometry) is a good method to determine plant nutritional elements simultaneously.

Data showed that brand 1 is a real KH2PO4 fertilizer, but P and K concentrations are obviously lower than the labeled value; another brand contained little KH2PO4, so this fertilizer is a false fertilizer.

We can know that KH2PO4 fertilizers contain some other plant nutritional elements, such as B, Si and Zn, so KH2PO4 fertilizers not only provide K and P but also some trace elements.