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Detection device and detection method for continuous flow of total cyanide in water

A flow detection and cyanide technology, applied in the field of chemical analysis, can solve the problems of optical background subtraction, unsuitable total cyanide detection in seawater, total cyanide detection limit, etc., and achieves fast detection speed, good accuracy, and detection limit. low effect

Inactive Publication Date: 2012-12-19
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing flow injection analysis method cannot provide optical background subtraction, and is not suitable for the detection of total cyanide in seawater, and the detection limit of total cyanide in environmental water bodies is relatively high, such as surface water, drinking water, etc.

Method used

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  • Detection device and detection method for continuous flow of total cyanide in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of standard samples: the prepared mass concentrations were 100 μg L -1 , 60 μg L -1 , 40 μg L -1 , 20 μg L -1 , 10 μg L -1 , 5 μg L -1 , 2.5 μg L -1 Total cyanide standard solution.

[0032] Preparation of distilled solution: dissolve 45.0g citric acid in 800ml distilled water, then add 90.0g sodium hydroxide, set the volume to 1L, and adjust the pH to 2.0;

[0033] Preparation of Chloramine-T Reactant: Dissolve 0.5g Chloramine-T in 800ml of distilled water, set the volume to 1L, and obtain a concentration of 0.5g L -1 Chloramine-T;

[0034] Preparation of isonicotinic acid and 1,3-dimethylbarbituric acid developer: dissolve 10.0g isonicotinic acid and 9.5g 1,3-dimethylbarbituric acid in 500ml of distilled water, and set the volume in 1L, adjust the pH to 4.0 to obtain a concentration of 10.0L -1 isonicotinic acid and its concentration is 9.5g L -1 1,3-Dimethylbarbituric acid developer;

[0035] Preparation of buffer solution: Dissolve 2.5g NaO...

Embodiment 2

[0043] 1. Preparation of standard samples: the prepared mass concentration is 100μgL -1 , 60 μgL -1 , 40 μgL -1 , 20 μg L -1 , 10 μg L -1 , 5 μgL -1 , 2.5 μgL -1 Total cyanide standard solution.

[0044] Preparation of distilled solution: dissolve 50.0g citric acid in 800ml distilled water, then add 100.0g sodium hydroxide, set the volume to 1L, and adjust the pH to 3.8;

[0045] Preparation of Chloramine-T Reactant: Dissolve 2.0g Chloramine-T in 800ml of distilled water, set the volume to 1L, and obtain a concentration of 2.0g L -1 Chloramine-T;

[0046] Preparation of isonicotinic acid and 1,3-dimethylbarbituric acid developer: dissolve 13.5g isonicotinic acid and 16.0g 1,3-dimethylbarbituric acid in 500ml of distilled water, and set the volume in 1L, adjust the pH to 5.0 to obtain a concentration of 13.5L -1 isonicotinic acid and its concentration is 16.0g L -1 1,3-Dimethylbarbituric acid developer;

[0047] Preparation of buffer solution: Dissolve 2.5g NaOH in 5...

Embodiment 3

[0055] 1. Preparation of standard samples: the prepared mass concentration is 100μgL -1 , 60 μg L -1 , 40 μg L -1 , 20 μg L -1 , 10 μg L -1 , 5 μg L -1 , 2.5 μg L -1 Total cyanide standard solution.

[0056] Preparation of distilled solution: dissolve 55.0g citric acid in 800ml distilled water, then add 105.0g sodium hydroxide, set the volume to 1L, and adjust the pH to 5.0;

[0057] Preparation of Chloramine-T Reactant: Dissolve 2.5g Chloramine-T in 800ml of distilled water, set the volume to 1L, and obtain a concentration of 2.5g L -1 Chloramine-T;

[0058] Preparation of isonicotinic acid and 1,3-dimethylbarbituric acid developer: dissolve 14.0g isonicotinic acid and 16.8g 1,3-dimethylbarbituric acid in 500ml of distilled water, and set the volume in 1L, adjust the pH to 6.5 to obtain a concentration of 14.0L -1 isonicotinic acid and its concentration is 16.8g L -1 1,3-Dimethylbarbituric acid developer;

[0059] Preparation of buffer solution: Dissolve 2.5g NaOH ...

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Abstract

The invention discloses a detection device and a detection method for continuous flow of total cyanide in water. The detection method comprises the following steps: firstly, decomposing complex cyanide in a sample flow through an ultraviolet lamp under a condition of weak acidic medium; filtering stray light by using a borosilicate glass spiral pipe; carrying out on-line vacuum distilling; causing a processed to-be-detected water sample to be mixed and reacted with chlorine ammonia-T reactant, isonicotinic acid and 1,3-dimethyl barbituric acid color developing agent at different flow speeds; performing continuous flow sampling on a solution after reacting; and injecting a spectrophotometer for detecting. According to the detection method provided by the invention, the operation is simple; the quantity of the required reagent and sample is small; the detection speed is high; the limit of detection is lower and the precision and the accuracy are excellent; the detection method is applied to the accurate and quick detection for the total cyanide in an unstable sample with serious matrix interference, such as seawater; and the detection method is suitable for the detection for the total cyanide in mass samples, such as surface water, underground water and water at draining outlets.

Description

technical field [0001] The present invention relates to a device and a method for testing or analyzing a substance by means of measuring its chemical or physical properties, in particular, it relates to a detection device and a detection method for total cyanide in the field of chemical analysis. Background technique [0002] Cyanide is a highly toxic substance, and its toxicity to the human body is mainly due to the combination with ferricytochrome oxidase to generate cyanide ferricytochrome oxidase and lose the function of transferring oxygen, causing tissue hypoxia asphyxia. Natural water generally does not contain cyanide; cyanide in water mainly comes from the pollution of industrial wastewater such as electroplating, mineral processing, chemical industry, and pesticides. It generally exists in various forms in water, including simple cyanide, complexes, and organic cyanides. Compounds in various forms. Total cyanide in water is an important indicator to characterize t...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 王晓楠潘献辉
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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