摘要
对土壤中水溶性阴离子进行测定,可监测土壤盐渍化的类型和程度,为改良、治理及科学施肥提供参考。土壤样品经风干研磨过0.15 mm筛,以去离子水萃取、0.22μm微孔滤膜过滤,用碳酸钠和碳酸氢钠溶液等度洗脱,离子色谱仪同时测定土壤萃取液中F^(-)、BrO_(3)^(-)、Cl^(-)、NO_(2)^(-)、Br^(-)、NO_(3)^(-)、PO_(4)^(3-)、SO_(4)^(2-)等8种水溶性阴离子含量。结果表明:8种阴离子在0.2~10.0 mg/L曲线线性关系良好,相关系数大于0.999;土壤样品阴离子检出限为0.6~7.0 mg/kg;进行3浓度水平加标实验,回收率为65.6%~120%,相对标准偏差为0~8.9%,表明方法具有较高的精密度和准确度。方法用于蔬菜种植基地、农田、绿化带土壤及养殖塘泥检测,结果显示,样品中检出F^(-)、Cl^(-)、NO_(2)^(-)、Br^(-)、NO_(3)^(-)、PO_(4)^(3-)和SO_(4)^(2-),浓度为5.0~1 090.6 mg/kg,均未检出BrO_(3)^(-)。各类型土壤阴离子浓度差异较大,蔬菜种植基地土壤中含有较高的Cl^(-)、NO_(3)^(-)或SO_(4)^(2-),可能与长期施用特定类型的化肥有关,农田土壤和塘泥长时间处于水中,水溶性阴离子已充分溶解,各阴离子含量较低;绿化带土壤未充分开垦,阴离子浓度接近于该类型土壤本底值。
The determination of water-soluble anions in soil can monitor the type and degree of soil salinization,as well as provide reference for its improvement,management,and scientific fertilization.The soil samples were ground to pass 0.15 mm sieve after air-dried,the water-soluble anions were extracted by deionized water,then filtered by 0.22μm membrane,the F^(-),BrO_(3)^(-),Cl^(-),NO_2^(-),Br^(-),NO_3^(-),PO_(4)^(3-)and SO_4^(2-)were separated by Na_2CO_(3)and NaHCO_(3)solution as isocratic elution,then determined by ion chromatography.The results showed that,the calibration curves of 8 kinds of anion had a good linearity in concentration ranges of 0.2—10.0 mg/L,and the correlation coefficient were more than 0.999;The detection limits for anions in soil samples were 0.6—7.0 mg/kg.Spiked test was made at 3 concentration levels,with the recoveries were 65.6%—120%,and RSDs were 0.2%—9.8%,which indicated that the method was high precision and accuracy.This method was used to detect the soil from vegetable planting base,farmland,green belt and pond silt.Results showed that F^(-),Cl^(-),NO_2^(-),Br^(-),NO_3^(-),PO_4^(3-)and SO_4^(2-)were detected,and the concentration were within 5.0—1090.6 mg/kg,while BrO_3^(-)was not detected.There were significant differences in the concentration of anions among different types of soil.The soil in vegetable planting bases contained higher levels of Cl^(-),NO_3^(-),or SO_4^(2-),which might be related to the long-term application of specific types of fertilizers.Farmland soil and pond silt were in water for a long time,and water-soluble anions had been fully dissolved,resulting in lower levels of anions.The soil in the green belt had not been fully cultivated,and the anion concentration was closed to the background value of this type of soil.
作者
刘健
明荔莉
陈巧兰
廖佳
郭海灵
LIU Jian;MING Lili;CHEN Qiaolan;LIAO Jia;GUO Hailing(Gongbei Customs District Technical Center,Zhuhai,Guangdong 519015,China;Zhuhai Institute for Food and Drug Control,Zhuhai,Guangdong 519015,China)
出处
《中国无机分析化学》
CAS
北大核心
2024年第11期1537-1543,共7页
Chinese Journal of Inorganic Analytical Chemistry
基金
拱北海关科研项目(2023GK017)
珠海市科技计划项目(ZH22036201210115PWC)。
关键词
离子色谱法
土壤
阴离子
盐渍化
电导检测器
ion chromatography
soil
anion
salinization
conductivity detector
