纳米LDHs-DGT用于土壤环境无机砷提取检测技术研究  

Extraction and detection of inorganic arsenic in the environment using nanometer LDHs-DGT

作　　者：张润祺 王震 田佩宁 张闯闯 戴礼洪 王玉姣 赵玉杰 ZHANG Runqi;WANG Zhen;TIAN Peining;ZHANG Chuangchuang;DAI Lihong;WANG Yujiao;ZHAO Yujie(Agro-Environmental Protection Institute,Key Laboratory for Environmental Factor Control of Agro-product Quality Safety,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China)

机构地区：[1]农业农村部环境保护科研监测所,农业农村部农产品质量安全环境因子控制重点实验室,天津300191

出　　处：《农业环境科学学报》2023年第8期1893-1904,共12页Journal of Agro-Environment Science

基　　金：西藏自治区地方标准制修订项目(XZ-NYHJBZ-202205)。

摘　　要：为有效测量土壤环境中的砷污染,本研究开发了一种基于纳米层状双金属氢氧化物(LDHs)为结合膜的梯度扩散薄膜设备(LDHs-DGT)。对设备的基本性能以及适用条件进行了探究,对不同水分管理下土壤As(Ⅲ)和As(Ⅴ)的动态变化进行监测,探究了不同水分管理下的不同深度砷的形态变化情况,实验结果表明,该技术能够在较宽的pH(4~8)和离子强度(CNaNO_(3)<0.7 mol·L^(-1))范围内对As(Ⅲ)和As(Ⅴ)进行有效的提取和检测,其中,LDHs结合膜对As(Ⅲ)和As(Ⅴ)的吸附容量分别为30μg·cm^(-2)和85μg·cm^(-2),结合膜在6 h内实现全解离;且LDHs-DGT具有较好的抗干扰特性,As(Ⅲ)和As(Ⅴ)在结合膜上没有明显的竞争吸附效应,对实际样品测定结果也能较好地反映DGT设备的实用性。综上所述,LDHs-DGT具有制备简单、适用范围广、检测效果好等特点,可为环境监测和评估提供新的解决方案。For the effective measurement of arsenic(As)contamination in soil environment,a gradient diffusion thin film device(LDHs-DGT)based on nano-layered bimetallic hydroxides(LDHs)as a binding film was developed in this study.The basic performance of the LDHs-DGT device and the applicable conditions were explored.Furthermore,the dynamic changes of soil As(Ⅲ)and As(Ⅴ),and morphological changes of As at different depths under different moisture conditions were explored.The experimental results showed that the novel device was able to measure As over a wide ranges of pH(4–8)and ionic strength(CNaNO_(3)<0.7 mol·L^(-1))for the effective extraction and detection of As(Ⅲ)and As(Ⅴ).The adsorption capacities of LDHs-bound membranes were 30μg·cm^(-2) and 85μg·cm^(-2) for As(Ⅲ)and As(Ⅴ),respectively.The bound membranes achieved total dissociation within 6 h.The LDHs-DGT had good anti-interference properties,and As(Ⅲ)and As(Ⅴ)on the bound membranes.There was no obvious competitive adsorption effect.The results of the actual sample determination reflected the practicality of the DGT device.The findings demonstrate that the LDHs-DGT device enables simple preparation,good detection,and is widely applicable.The device may be valuable for environmental monitoring and assessment.

关 键 词：层状双氢氧化物 梯度扩散薄膜技术 三价砷 五价砷 动态监测 

分 类 号：X833[环境科学与工程—环境工程]