Colorimetric Detection of Mercury in Aqueous Media Based on Reaction with Dithizone
This study investigates the colorimetric reaction between dithizone and mercury in aqueous media which generate the orange Hg-dithizone complexes extracted by chloroform. Then combining with spectral analysis, the UV-vis spectral data of the complexes are
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College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China [email protected], [email protected], [email protected] Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, Beijing, China 3 Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, Beijing, China
Abstract. This study investigates the colorimetric reaction between dithizone and mercury in aqueous media which generate the orange Hg-dithizone complexes extracted by chloroform. Then combining with spectral analysis, the UV-vis spectral data of the complexes are obtained to build a forecast model. By means of the multiple linear regression model with SG smoothing method, RPD (Residual Predictive Deviation) of 3.2461 is reached with the detection limit of 0.1129 ug/L. This colorimetric method was found to be rapid, simple and sensitive for the detection of mercury in aqueous medium. Keywords: Mercury
Dithizone Colorimetry Spectroscopy
1 Introduction There are two forms of mercury in nature, organic mercury complexes and inorganic mercury, which can change to each other forms dependent on the ambient conditions [1]. Pollution caused by heavy metals has negative effects on human health and the environment, which is from rock weathering and industrial emissions, volcanic movement [2, 3]. Mercury can be passed by aquatic plants and animals through food chain to human bodies with long term bio-accumulation, which show great toxicity with little content. Mercury ions have a strong affinity with thiol groups in the body so that mercury ions could interact with substances which contains most thiol groups such as proteins and enzymes involved in the body’s metabolism [4–6]. Therefore, finding a rapid and efficient method for the detection is of great realistic importance. For its detection, atomic emission spectrometry, high performance liquid chromatography and stripping voltammetry have been developed for detection of mercury in soil and aqueous samples, which need expensive instruments and usually need professional operators [7]. Colorimetric detection is simple and rapid, which can read out with the naked eyes though most methods have been proposed [8]. Reagent colorimetric method refers to comparing or measuring the colored substance solution or to measure the concentration of contents, based on chromogenic reactions that generate colored compounds. © IFIP International Federation for Information Processing 2016 Published by Springer International Publishing AG 2016. All Rights Reserved D. Li and Z. Li (Eds.): CCTA 2015, Part II, IFIP AICT 479, pp. 111–116, 2016. DOI: 10.1007/978-3-319-48354-2_11
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2 Materials and Instrumentation 2.1
Materials
HgCl2 , Dithizone, carbon tetrachloride, sodium sulfite, nitric acid, distilled water were purchased from Yixiubogu (Beijing, China). All the chemicals used for the study were following the standard procedures. 35 ml mercury solutions with various concentrations are put
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