超声提取–离子色谱法测定土壤易溶盐中的氯离子和硫酸根离子

采用超声提取的方式,以离子色谱法测定土壤易溶盐中的氯离子和硫酸根离子。对实验条件进行了优化,色谱柱为NJ–SA–4A柱(250 mm×2 mm),保护柱为SI–92G柱(50 mm×4 mm),淋洗液为1.8 mmol/L Na_2CO_3–1.7mmol/L NaHCO_3,流量为1.0 m L/min;在40℃下,对土壤样品提取10 min。Cl~–和SO_4~(2–)在检测范围内均线性良好,线性相关系数为0.999 8,加标回收率分别为95.0%~99.0%,96.0%~101.0%,测定结果的相对标准偏差分别为1.4%,1.0%(n=4)。与传统的方法相比,该法试剂用量少,操作简单,可用于土壤易溶盐样品的测定。

Determination of Chloride and Sulfate Dissolvable Salt in Soil Sample by Ultrasound-Assisted Extraction Ion Chromatography

The method for determination of chloride and sulfate in the soil was developed by ultrasound-assisted extraction and ion chromatography,the sample was extracted by ultrasonic extraction method.The experiment conditions were optimized.The chromatographic column was NJ-SA-4A column (250 mm× 2 mm),protective column was SI-92G column (50 mm× 4 rmm).The mobile phase was 1.8 mmol/L Na2CO3-1.7 mmol/L NaHCO3 at flow rate of 1.0 mL/min.The linearity of chloride,sulfate was fine in the detection range,the corelation coefficient was 0.999 8.The addition recoveries of chloride and sulfate were 95.0％-99.0％,96.0％-101.0％,and relative standar deviation of detection results were 1.4％,1.0％(n=4),resipectively.Compared with traditional method,this method was in low reagent consumption,simple in operation and it is suitable for the determination of dissolvable salt in soil samples.