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Development of a microfluidic membraneless vaporization flow system for trace analysis of arsenic
Analytical Methods ( IF 3.1 ) Pub Date : 2020-12-7 , DOI: 10.1039/d0ay01970d Nuanlaor Ratanawimarnwong 1, 2, 3, 4, 5 , Patcharat Ruckchang 1, 2, 3, 4, 5 , Supattra Yooram 1, 2, 3, 4, 5 , Kriangsak Songsrirote 1, 2, 3, 4, 5 , Kanchana Uraisin 1, 2, 5, 6, 7 , Victor Cerdà 1, 8, 9, 10
Analytical Methods ( IF 3.1 ) Pub Date : 2020-12-7 , DOI: 10.1039/d0ay01970d Nuanlaor Ratanawimarnwong 1, 2, 3, 4, 5 , Patcharat Ruckchang 1, 2, 3, 4, 5 , Supattra Yooram 1, 2, 3, 4, 5 , Kriangsak Songsrirote 1, 2, 3, 4, 5 , Kanchana Uraisin 1, 2, 5, 6, 7 , Victor Cerdà 1, 8, 9, 10
Affiliation
A new design of a membraneless vaporization (MBL-VP) unit coupled with a specific flow system is presented for the determination of arsenic at trace levels using a hydride generation process. The MBL-VP unit contains two concentric conical reservoirs, with the outer cone selected as the donor reservoir. The volume of the outer donor reservoir is thereby greater than the acceptor volume, necessary for holding sufficient sample and reagents for the generation of arsine gas by reaction between As(III) and sodium borohydride under acidic conditions. The arsine gas diffuses into the narrow headspace and is absorbed by an aliquot of 150 μL of mercuric chloride acceptor solution. The resulting reaction produces hydronium ions which is monitored by the absorbance change at 530 nm of the methyl orange indicator added in the acceptor solution. To decrease the detection limit, the aspiration and removal of the donor plug, comprising the sample, borohydride and acid, into and out of the donor cone are repeated several times, while the acceptor solution is kept unchanged. As a result, analysis of arsenic was achieved in the range of 10 to 100 μg L−1 with a detection limit of 8 μg L−1. Application to surface water was investigated. Percent recoveries of spiked surface water samples were in the range of 94–110%. For comparison of total arsenic (As(III) and As(V)), the results obtained from the developed method are not statistically different from the ICP-OES method.
中文翻译:
开发用于微量痕量砷的微流体无膜汽化流动系统
提出了一种新的无膜汽化(MBL-VP)装置与特定的流量系统相结合的设计,用于使用氢化物生成过程测定痕量砷。MBL-VP单元包含两个同心圆锥形容器,外锥被选作供体容器。因此,外部供体储存器的体积大于受体的体积,这对于容纳足够的样品和试剂(通过As(III)之间的反应生成rs气)是必需的)和硼氢化钠在酸性条件下。rs气扩散到狭窄的顶部空间,并被等分试样的150μL氯化汞受体溶液吸收。所产生的反应产生水合氢离子,该水合氢离子由加入到受体溶液中的甲基橙指示剂在530 nm处的吸光度变化监控。为了降低检测限,将供体塞子(包括样品,硼氢化物和酸)从供体锥体中抽出和抽出重复几次,而受体溶液保持不变。结果,在10至100μgL -1的范围内实现了砷的分析,检出限为8μgL -1。研究了其在地表水中的应用。加标的地表水样品的回收率在94-110%之间。为了比较总砷(As(III)和As(V)),从开发方法获得的结果与ICP-OES方法没有统计学差异。
更新日期:2020-12-17
中文翻译:
开发用于微量痕量砷的微流体无膜汽化流动系统
提出了一种新的无膜汽化(MBL-VP)装置与特定的流量系统相结合的设计,用于使用氢化物生成过程测定痕量砷。MBL-VP单元包含两个同心圆锥形容器,外锥被选作供体容器。因此,外部供体储存器的体积大于受体的体积,这对于容纳足够的样品和试剂(通过As(III)之间的反应生成rs气)是必需的)和硼氢化钠在酸性条件下。rs气扩散到狭窄的顶部空间,并被等分试样的150μL氯化汞受体溶液吸收。所产生的反应产生水合氢离子,该水合氢离子由加入到受体溶液中的甲基橙指示剂在530 nm处的吸光度变化监控。为了降低检测限,将供体塞子(包括样品,硼氢化物和酸)从供体锥体中抽出和抽出重复几次,而受体溶液保持不变。结果,在10至100μgL -1的范围内实现了砷的分析,检出限为8μgL -1。研究了其在地表水中的应用。加标的地表水样品的回收率在94-110%之间。为了比较总砷(As(III)和As(V)),从开发方法获得的结果与ICP-OES方法没有统计学差异。