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

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 μg/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.