Yankuang ceshi (Mar 2020)
Simultaneous Determination of Trace Arsenic, Copper, Lead, Zinc, Nickel and Vanadium in Soils by Hydride Generation-Inductively Coupled Plasma-Optical Emission Spectrometry
Abstract
BACKGROUND Hydride generation-atomic fluorescence spectrometry (HG-AFS) is widely used for the determination of arsenic in soil. Inductively coupled plasma-optical emission spectrometry (ICP-OES) is widely used in the simultaneous determination of multiple elements, but the detection limit of arsenic is slightly higher. The combination of hydride generation technology and ICP-OES has been widely studied, which can greatly reduce the detection limit of arsenic and yield the simultaneous determination of arsenic, antimony, bismuth, mercury and other elements. However, the combination technology can only be used to determine easy hydrogenation elements but it cannot simultaneously determine easy hydrogenation elements and difficult hydrogenation elements. OBJECTIVES To obtain the simultaneous determination of arsenic and various metal elements in samples by one dissolved sample and one apparatus. METHODS The soil samples were dissolved by hydrofluoric acid, nitric acid, perchloric acid and hydrochloric acid, followed by the addition of thiourea ascorbic acid solution to reduce arsenic to +3, by using 10% hydrochloric acid as the dissolving medium. The elements were determined by double flow method at the same time. RESULTS For the coexisting ions in the solution, La and Dy higher than 1.0mg/L had interference on the determination of arsenic. These elements had no effect on the determination of arsenic, when K, Na, Ca, Mg, and Fe concentrations were lower than 50.0mg/L, Pb, Mo, Zn, Cu, Ba, Ti, Mn, Ni, Sr, V, when Cr concentrations were lower than 20.0mg/L, and Co, Ag, U, Cd, Li, Au concentrations were lower than 10.0mg/L. CONCLUSIONS This method improves the sensitivity of arsenic and has the advantages of multi-element simultaneous determination. It can simultaneously determine trace arsenic and difficult hydrogenation elements such as copper, lead, zinc, nickel, and vanadium. The relative standard deviation (RSD) of the method is less than 5%. This method is confirmed by soil standard materials and is proved to be reliable and suitable for the simultaneous determination of trace arsenic and other elements.
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