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Automatic analysis device and method for formaldehyde in water
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An automatic analysis device, formaldehyde technology, applied in the field of analytical chemistry, can solve the problems of low sensitivity, bubble interference, long stabilization time, etc.
Active Publication Date: 2021-11-05
BEIJING BAODE INSTR CO LTD
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Compared with the two techniques, the advantages of FIA technique are high sensitivity and fast analysis speed, but the disadvantage is that the reagent needs to be degassed, otherwise the detection process will be greatly disturbed by air bubbles
SCFA itself needs to add air bubbles in the flow path, so the reagent does not need to be degassed, but the SCFA system has a long stable time, low sensitivity, and slow analysis speed, so automatic analyzers using FIA technology are more and more widely used
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Embodiment 1
[0065] Standard samples of formaldehyde in water with concentrations of 0.0, 0.05, 0.10, 0.20, 0.50, and 1.0 mg / L are used to test the automatic analysis device for formaldehyde in water of the present invention as follows.
[0066] The standard solution of formaldehyde in water was purchased from the National Standards Center, with a concentration of 1000mg / L. Dilute the 1000mg / L formaldehyde standard solution with deionized water to 10mg / L and 1mg / L, and prepare 0.05, 0.10, 0.20, 0.50, 1.0mg / L with 10mg / L and 1mg / L formaldehyde stock solution in water in sequence Standard sample series.
[0067] The above-mentioned standard sample was analyzed using the automatic analysis device for formaldehyde in water of the present invention, and the results are shown in Table 1.
[0080] As in Example 1, under the condition that other conditions are constant, change the kind of developer, adopt potassiumpersulfate, concentration is 10g / L, measure the standard sample of formaldehyde in water, the result is shown in Table 3.
[0086] As in Example 1, under other conditions unchanged, change the internal diameter of the reaction pipeline, measure the standard solution of formaldehyde in 0.050mg / L water, and its absorbance value is listed in Table 4.
[0087] Table 4 The influence of capillary tubes with different inner diameters on the absorbance value
[0089] From the results in Table 4, the results of 0.8mm and 1.0mm are relatively close, but the sensitivity of 0.8mm is the highest, so the 0.8mm diameter capillary is selected.
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Abstract
The automatic analysis device and method for formaldehyde in water of the present invention, wherein the automatic analysis device for formaldehyde in water comprises an automatic sampler, a peristaltic pump, a chemical reaction unit, and a detector, and the detector is used to detect the absorbance of the mixed solution. The automatic analysis method of formaldehyde in water of the present invention comprises: make sample and EDTA-KOH mix, form the first mixed solution after mixing reaction; The first mixed solution and AHMT mix reaction, form the second mixed solution; reagent mixing reaction to form the third mixed solution; detect the absorbance of the third mixed solution; make a standard curve according to the peak height or peak area of the measured absorbance of the standard solution and the concentration of the standard solution, and calculate on the standard curve according to the peak height of the absorbance of the sample The formaldehyde content in the sample was determined. The technical scheme of the invention can automatically add reagents, automatically measure samples and reference absorbance, and automatically complete the concentration measurement of formaldehyde in samples, with high sensitivity, good repeatability, high accuracy, simple and fast operation.
Description
technical field [0001] The invention relates to the field of analytical chemistry, in particular to an automatic analysis device and method for formaldehyde in water. Background technique [0002] Formaldehyde has been determined by the World Health Organization as a carcinogenic and teratogenic substance. As a by-product of disinfection in drinking water, it is a toxicological indicator in the testing indicators of drinking water. The only method for the detection of formaldehyde in GB / T 5750.6, the standard test method for drinking water in my country, is the 4-amino-3-hydrazine-5-mercapto-1,2,4-triazolone (AHMT) spectrophotometric method. The method has high sensitivity and good selectivity. However, the main problem of this method is that after AHMT is added, it needs to be left for 20 minutes before adding potassiumperiodate solution, shaking for half a minute and then standing for 5 minutes to measure the absorbance. Not only the sample analysis time is long, but also...
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