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Methyl orange spectrophotometric determination method for bromine in air of operational site

A technique of workplace and determination method, which is applied in the field of determination of bromine in workplace air by methyl orange spectrophotometry, and achieves the effect of reliable implementation, easy implementation and reliable method

Inactive Publication Date: 2009-08-12
青岛谱尼测试有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the national occupational health standard does not have a method for the determination of bromine in the air of the workplace. The method "determination of bromine content in the air of the workplace by methyl orange spectrophotometry" is convenient and reliable, and meets people's testing work and research needs.

Method used

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  • Methyl orange spectrophotometric determination method for bromine in air of operational site
  • Methyl orange spectrophotometric determination method for bromine in air of operational site
  • Methyl orange spectrophotometric determination method for bromine in air of operational site

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1. Determination of the bromine content in the air of the batching workshop:

[0025] Sampling point in the batching workshop (temperature: 18℃, pressure: 100.3kPa). Connect a porous glass plate absorption tube containing 10.0ml of methyl orange absorption solution to the atmospheric sampler, and sample for 15 minutes at a flow rate of 0.5L / min. Transfer all the collected sample solution to a 10ml colorimetric tube, accurately pipette 2.0ml of the sample solution into another colorimetric tube, dilute with water to the marking line, and mix well. After standing for 40 minutes, use a 1cm cuvette, at a wavelength of 507nm, with water as a reference, use a spectrophotometer to measure the absorbance of the sample, and calculate the sample concentration; collect six parallel air samples in the same way.

[0026] Determination of method precision: Analyze the six parallel samples collected, according to the standard curve Y=0.2579X+0.0027, R 2 =0.9990 (λ=507nm) The bromi...

Embodiment 2

[0032] Example 2. Determination of bromine content in the air of the finished product workshop:

[0033] Sampling point in finished product workshop (temperature: 15℃, pressure: 99.8kPa). Connect a porous glass plate absorption tube containing 10.0ml of methyl orange absorption solution to the atmospheric sampler, and sample for 15 minutes at a flow rate of 0.5L / min. Transfer all the collected sample solution to a 10ml colorimetric tube, accurately pipette 2.0ml of the sample solution into another colorimetric tube, dilute with water to the marking line, and mix well. After standing for 40 minutes, use a 1cm cuvette, at a wavelength of 507nm, with water as a reference, use a spectrophotometer to measure the absorbance of the sample, and calculate the sample concentration; collect six parallel air samples in the same way.

[0034] Determination of method precision: analyze the collected six parallel samples, according to the standard curve Y = 0.2534X + 0.0024, R 2 =0.9993 (λ=507nm...

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Abstract

The invention relates to a spectrophotometric determination method for helianthine of bromine in the air in workplaces. Namely, an acquired air sample is appropriately treated, and is subjected to colorimetric assay by a spectrophotometer after the color of the sample solution is stable. The method for detecting the content of the bromine in the air in the workplaces is quick and effective, and has the relative standard deviation less than 10 percent and the detection limit of 0.3mu g / 10ml; and when the volume of the acquired air sample is 7.5L, the concentration limit of the method is 0.2mg / m. Therefore, the invention provides a reliable and convenient method for detecting the content of the bromine in the air in the workplaces, and can meet the needs of researches and air detection of the workplaces.

Description

Technical field [0001] The invention relates to a method for measuring bromine in the air of a workplace, in particular to a method for measuring bromine in the air of a workplace by methyl orange spectrophotometry. Background technique [0002] Bromine (Br 2 ) Is a dark brown fuming liquid with a strong pungent odor, atomic weight 79.9, melting point -7.2°C, boiling point 58.8°C, and volatile at room temperature. Bromine is irritating and corrosive to mucous membranes and skin, and can easily cause tearing and coughing; contact with liquid bromine or high-concentration bromine vapor can quickly cause serious damage. Studies have shown that the human body absorbs bromine to varying degrees when exposed to bromine. Inhalation of lower concentrations of bromine will quickly cause eye and respiratory mucosal irritation, headache, dizziness, general weakness, chest tightness, and dry cough. Symptoms such as nausea and vomiting; severe cough, difficulty breathing, asthma when inhaling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/10
Inventor 宋薇
Owner 青岛谱尼测试有限公司
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