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A rapid method for the determination of trace thallium in drinking water

A rapid determination of drinking water technology, applied in the direction of color/spectral characteristics measurement, etc., can solve the problems of low detection limit, many interference factors of electrochemical method, expensive equipment, etc., to reduce chemical reagents, shorten detection time, and shorten detection time Effect

Active Publication Date: 2015-12-02
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle of spectrophotometric measurement of thallium is to use azo dye color reagent, chlorpromazine hydrochloride and other amine color reagents to complex with thallium ions to form colored substances, and then colorimetrically quantify. This method has high accuracy in determining thallium. Wide range, suitable for constant and semi-micro analysis of thallium, while the determination of trace thallium requires a large amount of organic reagent extraction, which is easy to endanger operators and the environment, and the method interferes seriously; the electrochemical method has many interference factors, poor reproducibility, and stability Inductively coupled plasma mass spectrometry (ICP-MS) is a new testing technology developed in the 1980s, because of its extremely low detection limit, extremely wide dynamic linear range, multi-element It has been widely used due to its analytical and isotope analysis capabilities. Using inductively coupled plasma mass spectrometry, it is possible to easily measure thallium without any enrichment technology. This method has fast detection, high sensitivity, and strong anti-interference ability, and is widely used in geology and the environment. The detection of thallium in medium, but ICP-MS itself is expensive in equipment, high in operation and maintenance costs, and has high requirements for operators, so it is difficult to popularize
The atomic absorption method has become the recommended measurement method in the national standard (GB / T5750.6-2006) due to its advantages of fast, sensitive, good anti-interference, good selectivity, less sampling volume, and low instrument cost. However, the " "No flame atomic absorption spectrophotometry" still has certain defects, such as the large sample requirement is at least 500ml, and pretreatment such as co-precipitation and enrichment is required for the determination of water samples, which is not only complicated to operate, but also takes a long time for pretreatment (overnight ), and the sample repeatability is poor, the recovery rate of standard addition is low, especially at low concentration, and the use of a large amount of chemicals is likely to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: A method for rapid determination of trace thallium in drinking water, comprising the steps of:

[0026] (1) Water sample collection, transportation and storage: Take 100ml of factory water from a tap water plant, add 0.1ml of high-grade pure concentrated nitric acid to make the pH value <2, and then add a certain amount of thallium standard solution to make the water The concentration of thallium in the sample is 0.0001mg / L, and this solution is used as the target water sample to be tested. The target water sample to be tested should be stored at 4°C for no more than 7 days;

[0027] (2) Drawing of the standard curve of thallium absorbance: Quantification by external standard method, dilute the thallium standard stock solution purchased from the National Standard Material Center from 100mg / L to 0.02mg / L as the standard solution, and then use the standard solution to prepare thallium Concentrations are: 0mg / L, 0.0005mg / L, 0.001mg / L, 0.002mg / L, 0.004mg / L, 0.00...

Embodiment 2

[0036] Example 2: A method for rapid determination of trace thallium in drinking water, comprising the steps of:

[0037] (1) Water sample collection, transportation and storage: Take 100ml of factory water from a tap water plant, add 0.1ml of high-grade pure concentrated nitric acid to make the pH value <2, and then add a certain amount of thallium standard solution to make the water The concentration of thallium in the sample is 0.0002mg / L, and this solution is used as the target water sample to be tested. The target water sample to be tested should be stored at 4°C for no more than 7 days;

[0038] (2) Drawing of the standard curve of thallium absorbance: Quantification by external standard method, dilute the thallium standard stock solution purchased from the National Standard Material Center from 100mg / L to 0.02mg / L as the standard solution, and then use the standard solution to prepare thallium Concentrations are: 0mg / L, 0.0005mg / L, 0.001mg / L, 0.002mg / L, 0.004mg / L, 0.0...

Embodiment 3

[0047] Example 3: A method for rapid determination of trace thallium in drinking water, comprising the steps of:

[0048] (1) Water sample collection, transportation and storage: Take 100ml of factory water from a tap water plant, add 0.1ml of high-grade pure concentrated nitric acid to make the pH value <2, and then add a certain amount of thallium standard solution to make the water The concentration of thallium in the sample is 0.0005mg / L, and this solution is used as the target water sample to be tested. The target water sample to be tested should be stored at 4°C for no more than 7 days;

[0049] (2) Drawing of the standard curve of thallium absorbance: Quantification by external standard method, dilute the thallium standard stock solution purchased from the National Standard Material Center from 100mg / L to 0.02mg / L as the standard solution, and then use the standard solution to prepare thallium Concentrations are: 0mg / L, 0.0005mg / L, 0.001mg / L, 0.002mg / L, 0.004mg / L, 0.0...

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Abstract

The invention relates to a method for rapidly determining trace quantity of thallium in drinking water, which comprises the following steps: (1) acquiring, transporting and storing water sample; (2) drafting thallium absorbance standard curves: preparing standard series solutions, and then detecting absorbance of each solution of the standard series solutions by a graphite oven, and drafting thallium absorbance standard curves; (3) continuously enriching-determining the object sample to be detected on-line, condensing the object sample to be detected, and detecting the absorbance by a graphite oven; (4) calculating the thallium quality concentration of the object sample to be detected. The used reagent and operation process does not produce secondary pollution, and the detection limit can reach 0.00005 mg / L, and the detection reappearance is controlled within 5%, and the recovery rate reaches to 75-110%, and satisfies the thallium content limit value detection in drinking water GB / T5749-2006.

Description

technical field [0001] The invention relates to a method for determining trace thallium in water, in particular to a method for rapidly determining trace thallium in drinking water. Background technique [0002] Thallium (Tl) is a typical dispersed element, which is widely used in superconducting materials, high-energy physics, aerospace, military industry and other fields, but it is also a typical toxic element, and its toxicity is far higher than that of Cd, Pb, Hg, etc. Thallium is mainly distributed in potassium minerals and minerals, such as mica, showing lithophilic characteristics; at the same time, thallium is also widely distributed in sulfides, forming symbiotic combinations with Zn, Fe, As, etc., showing sulfophilic characteristics. The continuous development and utilization of mineral resources by humans and natural mineralization have exposed these minerals to the surface. Under epigenetic geological processes, Tl in them is easily released, enters the surface a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 刘力维郑怀礼叱干勇唐晓旻肖浪许志楠车飞
Owner CHONGQING UNIV