摘要
探讨了气相分子吸收光谱法测定土壤中氨氮时,硫化物、挥发性有机物、甲醛、乙草胺、丙烯酰胺、尿素等土壤中存在的物质对分析可能存在的影响,提出了干扰物质的去除方法.实验结果表明:硫化物、挥发性有机物、甲醛、乙草胺、丙烯酰胺、尿素对氨氮测定均产生负干扰,以对测定值误差的要求超过±10％来作为干扰的判定标准,则硫化物、挥发性有机物干扰明显,甲醛、乙草胺、丙烯酰胺、尿素干扰较小.土壤提取液中加入1 mL(1+1)盐酸及0.2 mL无水乙醇,加热煮沸2～3 min,可消除硫化物和挥发性有机物的干扰.
Abstract
This paper discusses the influence of sulfide,volatile organic compounds,formaldehyde,acetochlor,ac-rylamide and urea on the determination of ammonia nitrogen in soil,and proposes the removal method of interfer-ing substances.Experimental results show that sulfide,volatile organic compounds,formaldehyde,acetochlor,ac-rylamide and urea all have negative interference on the determination of ammonia nitrogen.If the error of the de-termination value is more than+10％,the interference of sulfide and volatile organic compounds is obvious,while the interference of formaldehyde,acetochlor,acrylamide and urea is small.Adding 1ml(1+1)hydrochloric acid and 0.2ml anhydrous ethanol into the soil extract solution,heating and boiling for 2～3 min,can eliminate the interference of sulfides and volatile organic compounds.
维普
万方数据