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对盐酸羟胺柠檬酸体系（９５℃水浴加热）提取土壤中游离氧化铁的实验条件进行了研究。在所选的实验条件下，该体系对土壤中游离氧化铁的提取能力与常用的连二亚硫酸钠柠檬酸钠重碳酸钠（ＤＣＢ法）体系相当，但避免了ＤＣＢ法中引入Ｎａ２Ｓ２Ｏ４给随后分离和测定造成的沉淀、基体效应等各种弊端。方法的精密度较好，ＲＳＤ（ｎ＝６）为２．５％～３．０％。
The experimental conditions for the extraction of free iron oxide in soil by hydroxylamine citric acid-citric acid system (95 ℃ water bath heating) were studied. Under the selected experimental conditions, the extraction capacity of free iron oxide in the soil was comparable to that of the conventional sodium dithionite-sodium citrate-sodium bicarbonate (DCB) system, but the introduction of Na2S2O4 into the DCB method was avoided Separation and determination of sedimentation, matrix effects and other defects. The precision of the method is better, RSD (n = 6) is 2.5% ~ 3.0%.