岩矿测试2024，Vol.43Issue(4)：614-621,8.DOI:10.15898/j.ykcs.202305110067
火焰原子吸收光谱法测定土壤中游离铁含量
Free Iron Determination in Soil by Flame Atomic Absorption Spectrometry
摘要
Abstract
Free iron oxide in soil is a product of weathering,migration,and transformation of soil parent materials.Its form,activation,and aging degree can reflect the soil forming process and environment.It is also the main carrier of soil variable charge and an important mineral bonding substance in soil,which can directly reflect the formation environment,formation process,and climate change of the soil.Therefore,accurate determination of free iron in soil has important practical significance.At present,free iron is measured using ultraviolet spectrophotometry.The experimental process for free iron is long,requiring the reduction of high valent iron to low valent iron.In addition,it requires a color development time of up to 24h,which is time-consuming and cannot meet the needs of large-scale sample testing.Flame atomic absorption spectrometry method is used to determine free iron in soil,and the influence of experimental conditions on the determination of free iron is studied.By optimizing the amount of sodium bicarbonate,reaction temperature,reaction time,and cleaning times during the sample determination process,a method for determining free iron in soil is established.The optimal experimental conditions are determined as follows:weigh 0.5g of sample,add 20mL of sodium citrate solution and 2mL of sodium bicarbonate solution,and cleaned once each at a reaction temperature of 75-80℃ for 15min.The detection limit(3σ)of this method is 0.05g/kg,the quantification limit is 0.20g/kg,the linear correlation coefficient of the standard curve is 0.9995,the precision(RSD,n=6)is 1.95％-3.76％,and the standard error is less than 5％,which meets the analysis requirements of soil investigation.It can be widely applied to the analysis of soil and sediment samples in soil investigation.关键词
土壤/游离铁/火焰原子吸收光谱法/柠檬酸钠溶液/碳酸氢钠溶液Key words
soil/free iron/flame atomic absorption spectrometry/sodium citrate solution/sodium bicarbonate solution分类
天文与地球科学引用本文复制引用
张随安,杨中瑞,段玉宇,杨凯淇,胡智杰,杨春,侯莎..火焰原子吸收光谱法测定土壤中游离铁含量[J].岩矿测试,2024,43(4):614-621,8.基金项目
陕西省公益性地质调查项目"建设用地与农用地土壤特殊污染物检测方法研究"(202114) （202114）
陕西省科技协会青年人才托举计划项目"富硒土壤中重金属污染的复合钝化体系研究"(NYKJ202223) （NYKJ202223）
陕西省公益性地质调查项目"战略性金属矿产检测能力建设与应用"(202410) （202410）
