Position: Home > Articles > Determination of Soluble Aluminum in Agricultural Soils by KF Replacing-Acid Titration
Hubei Agricultural Sciences
2009,48
(10)
2556-2558
KF置换-酸量法测定农业土壤中可溶性铝
作 者：
张晓;王瑞斌
单 位：
榆林学院管理学院;榆林学院化学与化工学院
关键词：
酸量法;农业土壤;可溶性铝
摘 要：
研究了测定农业土壤中可溶性铝的酸量滴定新方法。样品经湿法消解,在掩蔽干扰后的pH 7～8的滤液中,用稀NaOH溶液将Al3+沉淀为Al(OH)3,加入KF,反应置换出的KOH溶液,以酚酞为指示剂,用酸标准溶液进行滴定。测定结果的相对标准偏差小于2.5%,其加标回收率在95.2%～101.3%之间。结果表明,改进后的方法,具有操作简单、测定快捷、准确度高、干扰小等特点,测定结果与国家标准方法一致。
译 名：
Determination of Soluble Aluminum in Agricultural Soils by KF Replacing-Acid Titration
作 者：
ZHANG Xiao a,WANG Rui-bin b(a.College of Management;b.College of Chemistry and Chemical Engineering,Yulin University,Yulin 719000,Shaanxi,China)
关键词：
acid titration;agricultural soils;soluble aluminum
摘 要：
A new acid titration method for the determination of soluble aluminum(Al) in agricultural soils was introduced in this paper.The sample was wet-digested and eliminated disturbance at pH 7～8 in filtrates,the Al(OH)3 was obtained by adding NaOH in filtrate,then the content of Al which had been replaced by adding KF in Al(OH)3 to KOH was tittered with HCl in phenolphthalein indicator system.The results showed that its relative standard deviation was less than 2.5% and recovery was 95.2%～101.3% which indicated the modified method was simple,accurate and rapid with good reproducibility.The result was also consistence with the national standard.
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