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Method for determining sulfide in water by utilizing continuous flow method

A technology for the determination of sulfide and water, applied in the field of chemical detection, can solve the problems of high number of experimenters and ability requirements, complicated operation steps, etc., and achieve the effect of ensuring accuracy and stability, simple steps, and low detection limit

Inactive Publication Date: 2018-09-11
CHENGDU DRAINAGE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the measurement of sulfide requires pre-distillation, the operation steps are cumbersome, and the number and ability of experimenters are high.

Method used

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  • Method for determining sulfide in water by utilizing continuous flow method
  • Method for determining sulfide in water by utilizing continuous flow method
  • Method for determining sulfide in water by utilizing continuous flow method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 utilizes standard environmental sample to carry out precision analysis to this method

[0026] Take the following steps to test:

[0027] 1. Debugging of the instrument

[0028] Turn on the continuous flow analyzer, first replace the reagent with water, check the sealing of the entire analysis flow path and the smoothness of the liquid flow, and start feeding the reagent after the baseline is stable, and use the standard sulfide use solution for calibration after the baseline is stable again.

[0029] 2. Calibration

[0030] 1) Preparation of calibration solution: For the preparation of calibration solution, pipette an appropriate amount of sulfide standard solution into a 100ml volumetric flask, dilute to volume with 0.01mol / L sodium hydroxide, and prepare a standard series of 9 concentration points, sulfur mass Concentrations are: 0.00mg / L, 0.010mg / L, 0.050mg / L, 0.100mg / L, 0.300mg / L, 0.500mg / L, 1.00mg / L, 1.50mg / L, 2.00mg / L.

[0031] 2) Drawing of the c...

Embodiment 2

[0051] Embodiment 2 The detection limit determination of this method

[0052] According to the steps of Example 1, replace the sample with deionized water, repeat the measurement of n (n=8) blank tests, calculate the standard deviation of 8 parallel determinations, calculate the detection limit of the method according to the following formula, and the specific results are shown in Table 2 .

[0053] MDL=t(n-1,0.99)×S

[0054] In the formula:

[0055] MDL - method detection limit;

[0056] n - the number of parallel determinations of the sample;

[0057] t——the t-distribution (one-sided) when the degree of freedom is n-1 and the confidence level is 99%;

[0058] S——the standard deviation of n parallel determinations.

[0059] When the number of parallel determinations is 8, the t value is 2.998.

[0060] Table 2 Detection limit analysis of sulfide determination method

[0061]

Embodiment 3

[0062] Example 3 The addition and determination of sulfide in a sewage plant water sample

[0063] Using the assay method described in Example 1, a standard addition experiment was carried out on an influent water sample of a certain sewage plant with known sulfur content concentration, and the sulfur content after the addition was measured. The results are as shown in Table 3:

[0064] Table 3 Addition recovery test of sulfide in water samples

[0065]

[0066] It can be seen from the results in the table that the recovery rate of influent water standard addition is 94.6%, which meets the quality control index of the water quality monitoring laboratory, and the data obtained by the method are accurate and reliable.

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Abstract

The invention discloses a method for determining sulfide in water by utilizing a continuous flow method. The method comprises the following steps: injecting a feeding water sample and a chemical reagent into a flow analyzer by utilizing a pump; in the flow analyzer, enabling a distillation reagent to react with the sulfide in the feeding water sample and distilling; absorbing generated hydrogen sulfide gas by a sodium hydroxide solution; enabling an absorption solution to react with a color developing agent and ferric chloride; determining a reactant by utilizing a colorimeter. The method disclosed by the invention is used for determining the sulfide in the water so that the accuracy and stability of the detected sample are ensured and the detection limit is low; the method has simple steps and is easy to operate; the detection efficiency is improved and the repeatability is good.

Description

technical field [0001] The invention relates to the field of chemical detection, in particular to a method for measuring sulfide in water by a continuous flow method. Background technique [0002] Sulfides are widely found in natural water bodies and industrial wastewater. Because sulfide is toxic and harmful, its toxicity is mainly manifested as the release of H 2 S, H 2 S is a colorless, water-soluble gas with the smell of rotten eggs. It is corrosive, flammable, and lethal. It can cause physical discomfort at low concentrations, and can cause confusion, temporary brain damage, and even death at high concentrations. Asphyxiation. Due to the serious harm of sulfide, sulfide is an important indicator of water pollution. How to accurately measure sulfide in environmental water quality has important practical significance, which can provide more real and reliable scientific basis for environmental protection and governance. [0003] There are many detection methods for sul...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/31G01N21/78
Inventor 项念念佟玲李雨蛟谢海英曹佳红
Owner CHENGDU DRAINAGE CO LTD
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