Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for determining sodium nitrite content in industrial self-circulating water

A sodium nitrite and measurement method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of inability to measure high-content sodium nitrite solution, narrow measurement range, complicated operation, etc., and achieve relatively low cost, large measurement range, The effect of simple method

Inactive Publication Date: 2007-11-14
ANGANG STEEL CO LTD
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ion chromatography has high accuracy, the instrument is more expensive and the operation is complicated; although the spectrophotometry has the advantages of low cost, simple method, and convenient operation, the a-naphthylamine hydrochloride photometry and ultraviolet photometry are in the water sample. The measurement range is narrow, only 0-0.4mg / l and 0-25mg / l, and it cannot measure high-content sodium nitrite solution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention will be further described below in conjunction with specific embodiment:

[0014] A kind of assay method of the content of sodium nitrite in industrial self-circulating water, concrete steps are as follows:

[0015] Step 1: Accurately draw 25ml of sodium nitrite stock solution into a 100ml volumetric flask, dilute to the mark with grade III reagent water, and shake well;

[0016] Step 2: Accurately draw 0.5, 1.0, 1.5, 2.0, 2.5, 3.0ml of sodium nitrite standard solution, add them into 25ml colorimetric tubes respectively, dilute to the mark with grade III reagent water, use grade III reagent water as blank control, At 219.0nm, measure its corresponding absorbance with a 1cm quartz cuvette, and take the absorbance as the ordinate, and the nitrite ion content, in mg, as the abscissa to draw a standard curve;

[0017] Y is absorbance, X is NO 2 - Content, in mg, correlation coefficient r=0.992, according to the drawn curve, get the regression equati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This invention is a method to test the quantity of sodium nitrite in industry self-circulating water, involving a water-treating pharmaceutical analysis method. Steps are: first, preparing sodium nitrite reserves solution; second, drawing standard curve; third, testing water samples. when NaNO2 content is no greater than 100 mg / l the sampling volume is 1 ml, amino acid content is 0.2 - 1.0 ml; when NaNO2 content is 100 - 500 mg / , sampling is 0.2 - 0.4 ml, amino acid content is 0.5 to 1.0 ml; when NaNO2 content is the 500 to 1000 mg / l at, sampling is 0.1 - 0.2 ml , the amino acid content is 0.7 to 1.2 ml; when NaNO2 content is greater than 1000 mg / l, sampling need to be diluted. Testing reaction time is 5 - 15 min. This invention is accurate, simple, low-cost, wide range, and so on.

Description

technical field [0001] The invention relates to a method for analyzing water treatment chemicals, in particular to a method for measuring sodium nitrite content in industrial self-circulating water. Background technique [0002] Sodium nitrite, white yellowish orthorhombic crystal, easily soluble in water and liquid ammonia, the aqueous solution is alkaline. Sodium nitrite is poisonous, and the lethal dose is 2g. The limit concentration of sodium nitrite solution for skin contact is 1.5%. When the concentration is greater than this concentration, the skin will become inflamed and macule will appear. Sodium nitrite is a kind of water treatment chemical. It does not need to be dissolved. It is a corrosion inhibitor that can passivate metals in the presence of oxygen. It can be adsorbed on the metal surface to form a protective film and have a corrosion inhibitory effect on the system. [0003] When the solution contains chloride ions or sulfate ions, if the mass ratio of nitr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N21/31
Inventor 马丽娟李化
Owner ANGANG STEEL CO LTD