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: 2011-10-19
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
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Effect test

Embodiment 1

[0032] In this embodiment, the standard sample is tested to investigate 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, dilute to 100ml, refrigerate in the refrigerator, set aside, calibrate when used, and the calibration concentration is 835.516mg / L S 2- the 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 chromogenic solution 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 to 4.4. The concentration of Alizarin Red S prepared is 7.0×10 -4 mol / L of...

Embodiment 2

[0044] In this embodiment, the tested samples are river water and hot spring water, which are analyzed after being filtered through medium-speed filter paper. Its 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, dilute to 100ml, refrigerate in the refrigerator, set aside, calibrate when used, and the calibration concentration is 835.516mg / L S 2- the 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 / 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 chromogenic solution 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 Red S ...

Embodiment 3

[0062] In this embodiment, the sample to be tested is the same as that in Embodiment 2, and is analyzed after being filtered through medium-speed filter paper. Its analysis steps are as follows:

[0063] 1. Preparation of chromogenic solution 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 0.2mol / L, and use a pH meter to accurately adjust the pH of the mixed solution to 4.80. The concentration of Alizarin Red S prepared is 9.0×10 -4 mol / L of chromogenic solution R.

[0065] 2. Use deionized water as the driving solution C.

[0066] 3. Test drawing of sample spectrum

[0067] use figure 1 The automatic analyzer designed for the process flow shown in the test 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 t...

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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 detection and analysis method for sulfide in water samples, in particular to an automatic analysis method for sulfide in fresh water. Background technique [0002] Sulfide present in water, including dissolved H 2 S, HS - , S 2- , acid-soluble metal sulfides, and insoluble sulfides and organic sulfides. The sulfide measured in the present invention refers to the soluble inorganic sulfide in water and waste water. [0003] Groundwater (especially hot spring water), domestic sewage and industrial sewage usually contain sulfide, part of which is produced by the reduction of sulfate or the decomposition of sulfur-containing organic matter under anaerobic conditions due to the action of bacteria. When a large amount of domestic sewage and industrial sewage are discharged into the water system or sewer, due to the decomposition of sulfur-containing organic matter by microorganisms, sulfide exists in H 2 S is easy to escape fro...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/75G01N1/28
Inventor 张新申余兰
Owner SICHUAN UNIV
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