Determination method of cyanogen in thiocyanate

A determination method and thiocyanate technology, applied in the field of chemical analysis, can solve the problem of not measuring cyanide content, etc., and achieve the effects of reliable measurement results, no environmental pollution, and sensitive response.

Active Publication Date: 2012-07-04
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] At present, neither the industrial sodium thiocyanate nor the chemical reagent sodium thiocyanate standard (HG-T 3812-2006 and GB/T 1268-1998) has a m

Method used

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  • Determination method of cyanogen in thiocyanate
  • Determination method of cyanogen in thiocyanate
  • Determination method of cyanogen in thiocyanate

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Embodiment Construction

[0020] 1. Reagents and instruments used: Potassium cyanide standard sample (provided by Henan Provincial Analysis and Testing Center); reagent sodium thiocyanate (commercially available, analytically pure); industrial sodium thiocyanate (commercially available); heptahydrate sulfurous acid Iron (analytical pure). UV1800 spectrophotometer.

[0021] Both the reagent sodium thiocyanate and the industrial sodium thiocyanate are prepared as 10% and 50% solutions by mass percentage;

[0022] Mixed sample: 50% sodium thiocyanate solution containing 8 μg / mL cyanide.

[0023] Ferrous sulfate heptahydrate was prepared as a saturated ferrous sulfate solution with deionized water, and set aside.

[0024] 2. Method:

[0025] Accurately weigh 0.25 g of potassium cyanide in a 100 mL volumetric flask, dissolve it with deionized water and make up to the mark to prepare a standard stock solution with a concentration of 2.5 mg / mL. Prepare the standard stock solution with deionized water so t...

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Abstract

The invention discloses a determination method of cyanogen in thiocyanate, belonging to the field of chemical analysis. The method is characterized by adding a ferrous sulfate saturated solution in a thiocyanate solution to convert cyanogen into Prussian blue for coloration, and determining the absorbance of the Prussian blue at the wavelength of 700nm, wherein thiocyanate ions are nearly not absorbed within the wavelength range under the same processing condition, and the interference of thiocyanate is avoided. Through the method, favorable linearity is formed within the cyanogen content range of 4-30ppm, the linear regression equation is obtained as follows: Y=0.0261X-0.0433, and the related coefficient r is 0.9993. According to the method, under the existence of sodium thiocyanate withthe concentration of 50%, the relative standard deviation is 2.03%, the standard recovery rate is 98.8%-105.7%, and the minimum quantitative detection limit is 2.04ppm. The method is simple, is high in flexibility, is good in stability, and is low in detection expense, and the used reagents are safe and non-toxic.

Description

technical field [0001] The invention belongs to a method for measuring cyanide content in thiocyanate, relates to a spectrophotometric method for measuring cyanide in thiocyanate, and belongs to the field of chemical analysis. Background technique [0002] Free cyanide is a highly toxic substance, and it is one of the necessary inspection items for environmental monitoring and food analysis. Thiocyanate has a wide range of uses, and sodium thiocyanate is generally produced from sodium cyanide and sulfur as raw materials in industry, so the content of cyanide in thiocyanate directly affects the quality and safety of the product. At present, the methods for determining cyanide mainly include photometric method, chemical titration method (GB / T 23765-2009), ion chromatography and so on. The principle of the chemical titration method (GB / T 23765-2009) for determining cyanide is to complex the silver ion with the cyanide. After the reaction between the cyanide and the silver ion,...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 李中贤刘小培董学亮刘明徐丹余学军
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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