Method for automatically analyzing sulfide in water sample

An automatic analysis and sulfide technology, which is applied in the direction of chemical reaction of materials for analysis, preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of complex operation and low accuracy, and achieve a wide linear range , Eliminate the difference in absorbance and the effect of good precision

Inactive Publication Date: 2013-04-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The operation is more complicated, and the S in the sample is not used in the pretreatment 2- Loss is the key, its accuracy is not high
[0010] In recent years, flow injection spectrophotometry has attracted much attention because of its simple equipment, low reagent consumption, fast analysis speed, high measurement accuracy, and easy automatic control, but the choice of chromogenic solution is crucial to improve the analytical sensitivity and linear range , in the existing literature, there is no report of flow injection spectrophotometry using Alizarin Red S solution as chromogenic solution to directly measure sulfide in water samples

Method used

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  • Method for automatically analyzing sulfide in water sample
  • Method for automatically analyzing sulfide in water sample
  • Method for automatically analyzing sulfide in water sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, a standard sample was tested to examine the precision of the method of the present invention. The steps are as follows:

[0033] 1. Preparation of standard samples

[0034] (1) 0.7491g Na 2 S·9H 2 Dissolve O in deionized water, make up the volume to 100ml, refrigerate in the refrigerator for use, and calibrate when using, the calibration concentration is 835.516mg / L S 2- mother liquor;

[0035](2) Dilute the mother liquor with deionized water to prepare a standard sample with a sulfide concentration of 0.8355 mg / L.

[0036] 2. Preparation of color developer R

[0037] Take 35 mL of Alizarin Red S aqueous solution with a concentration of 0.01 mol / L and dilute to 500 mL. After mixing the prepared Alizarin Red S and Britton-Robinson buffer in equal volumes, add NaOH with a concentration of 0.2 mol / L, and use a pH meter to accurately adjust the pH of the mixed solution = 4.4. The concentration of Alizarin Red S is: 7.0×10 -4 mol / L of color developer...

Embodiment 2

[0044] In this example, the tested samples were river water and hot spring water, which were filtered through medium-speed filter paper for analysis. The analysis steps are as follows:

[0045] 1. Preparation of standard samples

[0046] (1) 0.7491g Na 2 S·9H 2 Dissolve O in deionized water, make up the volume to 100ml, refrigerate in the refrigerator for use, and calibrate when using, the calibration concentration is 835.516mg / L S 2- mother liquor;

[0047] (2) Dilute the mother liquor with deionized water and prepare a series of standard samples. The concentrations of sulfide in each standard sample are: 0.008355mg / L, 0.0167mg / L, 0.03340mg / L, 0.05013mg / L, 0.06680mg respectively / L, 0.08355mg / L, 0.25065mg / L, 0.41775mg / L, 0.6684mg / L, 0.8355mg / L, 1.671mg / L, 2.5065mg / L, 3.3420mg / L.

[0048] 2. Preparation of color developer R

[0049] Take 40 mL of Alizarin Red S aqueous solution with a concentration of 0.01 mol / L and dilute to 500 mL. After mixing the prepared Alizarin R...

Embodiment 3

[0062] In this example, the tested sample was the same as that in Example 2, and was analyzed after being filtered through medium-speed filter paper. The analysis steps are as follows:

[0063] 1. Preparation of color developer R

[0064] Take 45 mL of Alizarin Red S aqueous solution with a concentration of 0.01 mol / L and dilute to 500 mL. After mixing the prepared Alizarin Red S and Britton-Robinson buffer in equal volumes, add NaOH with a concentration of 0.2 mol / L, and use a pH meter to accurately adjust the pH of the mixed solution to 4.80. The concentration of Alizarin Red S is: 9.0×10 -4 mol / L of color developer R.

[0065] 2. Use deionized water to push liquid C.

[0066] 3. Test drawing of sample spectrum

[0067] use figure 1 The automatic analyzer designed for the shown process flow is tested. The low-pressure pump 1 in the instrument is a four-channel constant-flow pump, the pump flow rate is 0.4~1.0ml / min, and the working pressure is 2~3×10 5 Pa. The optica...

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Abstract

The invention provides a method for automatically analyzing sulfide in a water sample, comprising the following steps: (1) leading a developing bath and a pushing liquid to enter an analysis flow path so as to form a mixed liquid, leading the mixed liquid to enter an optical flow-through tank, transmitting a signal to a computer processing system by an optical detector, processing the signal to obtain a baseline, and simultaneously leading the sample to enter a sample feeding ring and filling the sample filling ring; (2) leading the sample in the sample feeding ring to enter the analysis stream under the pushing of the pushing liquid, leading the developing bath to enter the analysis flow path so as to generate developing reaction with the sample during the mixing, leading the formed mixed liquid to enter the optical flow-through tank, and transmitting the signal to the computer processing system by the optical detector so as to process the signal and obtain the sample spectrogram; (3) using a series of standard samples with known sulfide concentration to replace the samples, and repeating the step (1) and the step (2) to obtain a series of sample spectrogram; and (4) comparing the sample spectrogram with the sample with the standard sample spectrogram, and calculating the sulfide content in the sample. The developing bath is a solution that is prepared by alizarin red S and Britton-Robinson buffer solution.

Description

technical field [0001] The invention belongs to a method for detecting and analyzing sulfides in water samples, and particularly relates to an automatic analyzing method for sulfides in fresh water. Background technique [0002] Sulfides present in water, including soluble H 2 S, HS - , S 2- , acid-soluble metal sulfides, and insoluble sulfides and organic sulfides. The sulfides measured in the present invention refer to inorganic sulfides soluble in water and waste water. [0003] Groundwater (especially hot spring water), domestic sewage and industrial sewage usually contain sulfides, some of which are produced by the reduction of sulfates or the decomposition of sulfur-containing organics due to the action of bacteria under anaerobic conditions. When a large amount of domestic sewage and industrial sewage is discharged into the water system or sewers, the sulfur-containing organic matter is decomposed by microorganisms to decompose sulfide, which exists in H 2 S easi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/75G01N1/28
Inventor 张新申余兰
Owner SICHUAN UNIV
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