化肥成分分析系列标准物质研制

研制了尿素、磷酸氢二铵、氯化钾、高氮磷低氯复合肥、高氮低氯复合肥、高钾硫基复合肥、高钾中氯复合肥、高磷低氯复合肥和平衡型硫基复合肥系列化肥标准物质,样品严格按照相关标准要求进行采集、加工制备、均匀性检验、稳定性检验,由15家不同行业的权威实验室进行协作定值,并对不确定度进行评定.结果表明,样品粒度分布满足样品加工要求,...

The Development of Certified Reference Materials for the Chemical Composition of Chemical Fertilizers

The set of chemical fertilizer CRMs developed in this study include urea, diammonium hydrogen phosphate, potassium chloride, high nitrogen phosphorus low chlorine compound fertilizer, high nitrogen and low chlorine compound fertilizer, high potassium sulfur based compound fertilizer, high potassium and medium chlorine compound fertilizer, high phosphorus and low chlorine compound fertilizer and balanced sulfur based compound fertilizer. Samples were collected, processed, prepared, tested for uniformity and stability in strict accordance with the requirements of standards. Then, cooperative analyses for certification were performed by 15 authoritative laboratories from different departments. The results showed that the particle size distribution of the processed samples met the requirements of sample processing. The samples have good homogeneity, and the samples can be considered to be stable. Reference values of 45 elements (indexes) for this set of fertilizer reference materials were certified, including N, P₂O₅, water-soluble P₂O₅, available P₂O₅, K₂O, S, Cl, As, Hg, Cr, Cd, Cu, Pb, Zn, Ni, B, Se, Ge, Fe, Na, Ca, Mg, Al, Ti, V, Mn, Co, Sr, Mo, Ba, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. The certified values are reliable with reasonable uncertainty ranges, which meet the requirements of national first-class reference materials. The gradient range of major element content of the nine certified reference materials for chemical composition of chemical fertilizer is reasonable, which improves the types of certified reference materials for chemical fertilizer, and provides basic technical support for quality control of chemical fertilizer sample analysis, calibration of laboratory instruments, analysis methods and evaluation of laboratory ability.