Fertilizers and soil conditioners — Determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials
使用碱性提取法 疏水性吸附树脂测定商业固体和液体腐殖质中的腐殖酸和重铬酸盐测定
This document specifies the procedure for the analysis of humic acids and hydrophobic fulvic acids which is applicable to dry and liquid materials used as ingredients in commercial fertilizers, soil amendments, and geological deposits.