Low concentration soluble metal thallium on-line detection apparatus and method

Abstract

The present invention discloses a low concentration soluble metal thallium on-line detection apparatus and method, wherein the apparatus comprises an electrolysis cup, a blender, an electrochemical workstation, a microcomputer PC and an electrode group, the method is based on an anodic voltammetric stripping method for establishment of the online heavy metal thallium online apparatus, the method has high sensitivity and low detection limit, does not require large amounts of organic solvents, has no secondary pollution to operating personnel and environment, and can achieve rapid online detection. The on-line detection apparatus can be widely used in water source detection, drinking water security assurance and other fields.

Description

technical field [0001] The invention relates to a detection method of metal thallium, in particular to a device and method for online detection of low-concentration soluble metal thallium. Background technique [0002] 1) Basic properties and distribution of thallium: [0003] Thallium (T1) is a highly dispersed rare heavy metal element. Metal thallium is blue to silvery white, soft and malleable, very unstable in air, insoluble in water and easily soluble in acid. Thallium has two stable isotopes (203T129.5%, 205T170.5%) and 26 artificial radioactive isotopes. Thallium is widely used in high-energy physics, superconducting materials, medicine and health, aerospace, electronics, communications, military industry and chemical catalytic materials and other fields. [0004] Thallium is widely distributed in natural water bodies, and its content is generally low, with large regional differences. The content in Arctic snow water is only 0.3~0.9pg / L; the content in river water ...

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Problems solved by technology

[0025] The advantage of the suspended mercury electrode is good reproducibility, and the disadvantages are: ①The ratio of the electrode area to the volume is small, so that the sensitivity is low and the dissolution peak is wide; ②In order to prevent the mercury from falling, the stirring speed should be slow; ③It needs to be provided by a mercury dripping electrode. mercury drop

The disadvantages of mercury film electrodes are: ① poor reproducibility; ② other metals are required as substrates, among which silver, nickel, platinum, etc. have low overvoltage, and are slightly soluble in mercury, and may form between the substrate metal and the lined metal. Intermetallic compounds, resulting in poor reproducibility of dissolution peaks

The determination of trace Tl in wastewater is relatively simple, but the determination of Tl in ore samples is more cumbersome; Li Jinwen et al. used bayone hydroxyquinoline spectrophotometry to determine the content of Tl in water samples and pointed out that heavy metal ions have certain interference on the determination

[0031] The shortcoming that exists in the prior art is: the medium condition requirement of spectrophotometric determination T1 is stricter, and sensitivity is lower, needs a large amount of organic reagents to extract when measuring in trace and semi-micro amount, thereby has influenced recovery rate, and the application of a large amount of organic solvents will Hazardous to operators and the environment, not suitable for in-line instrument use

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