论文部分内容阅读
我们化验室在吉林农大革命师生亲临指导下,从今年5月下旬正式开展了“九二○”含量的检验工作,在上海的化验方法的基础上,合理地改变了部分操作,经萤光法核对校正,基本趋于准确,误差相差很小,有实际指导意义,现将化验方法介绍如下:一、试样的处理:取土法固体样品10克,在75℃烘干1小时,研碎后取样5克加水100毫升(蒸馏水)浸泡4小时(自然温度即可)用双层纱布过滤,滤液是混浊的。二、抽提分离操作:取滤液25毫升,加浓盐酸0.4毫升(比重1.12,化学试剂)调节pH1～2,统一放到分液漏斗中,加醋酸乙酯50毫升进行抽提,振摇
Under the guidance of Jilin Agricultural University teachers and students in our lab, our laboratory formally carried out the testing of the “920” content in late May this year. Based on the laboratory test method in Shanghai, we reasonably changed some of our operations. Law check the correction, the basic tends to be accurate, the error is small, practical guidance, the test methods are as follows: First, the sample processing: Take soil samples 10 grams of solid, dried at 75 ℃ for 1 hour, research After the crushed sample 5 g water 100 ml (distilled water) soak 4 hours (natural temperature can be) with double gauze filter, the filtrate is cloudy. Second, the extraction separation operation: Take the filtrate 25 ml, plus concentrated hydrochloric acid 0.4 ml (specific gravity 1.12, chemical reagents) to adjust pH1 ~ 2, unified into the separatory funnel, ethyl acetate 50 ml extraction extraction, shaking