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Detection agent for detecting urea concentration in water, preparation method and detection method thereof

A technology for urea concentration and water detection, which is applied in the field of chemical analysis, can solve the problems of long heating time, small absorbance, and narrow linear range, and achieve the effects of reduced reaction time, increased absorbance, and large linear range

Active Publication Date: 2021-06-22
SHANGHAI YIDIAN SCI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has been used for many years, it has the following disadvantages: small absorbance; narrow linear range; long reaction time; easy to fade after color development, a special brown colorimetric tube is required; long heating time, water evaporates, and the volume is not constant; Large volume, it is easy to introduce water into the water bath when the water bath is heated, which will cause errors, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a), the preparation of mixed acid

[0031] Weigh 1.8g of ferric ammonium sulfate, add 1mL of pure water, heat and dissolve in a water bath at 100°C, slowly add 100mL of phosphoric acid, stir to dissolve, then slowly add 200mL of sulfuric acid while stirring, mix well, cool to room temperature before use.

[0032] b), preparation of chromogenic agent

[0033] Weigh 0.2 g of diacetyl monoxime and 0.2 g of antipyrine respectively, dissolve them in pure water, mix them, and dilute to 100 mL. Store in a brown bottle.

[0034] c) Measurement method of urea in swimming pool water

[0035] Take 5mL of the water sample to be tested in the colorimetric tube, add 2mL of mixed acid and 1mL of chromogenic reagent, tighten the cap of the colorimetric tube, shake the colorimetric tube to mix the solution evenly. Place the colorimetric tubes evenly in a dedicated digester, and digest for 20 minutes at 105°C (while the national standard method requires 50 minutes for digestion, the d...

Embodiment 2

[0038] a), the preparation of mixed acid

[0039] Weigh 1.55g ammonium ferric sulfate, add 1mL pure water, heat to dissolve in 80°C water bath, slowly add 110mL phosphoric acid, stir to dissolve, then slowly add 200mL sulfuric acid while stirring, mix well, cool to room temperature before use.

[0040] b), preparation of chromogenic agent

[0041] Weigh 1.0 g of diacetyl monoxime and 1.0 g of antipyrine respectively, dissolve them in pure water, mix them, and dilute to 100 mL. Store in a brown bottle.

[0042] c) Measurement method of urea in swimming pool water

[0043] Take 5mL of the water sample to be tested in the colorimetric tube, add 2mL of mixed acid and 1mL of chromogenic reagent, tighten the cap of the colorimetric tube, shake the colorimetric tube to mix the solution evenly. Place the colorimetric tubes evenly in a dedicated digester, and digest for 20 minutes at 105°C (while the national standard method requires 50 minutes for digestion, the digestion time of t...

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PUM

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Abstract

The invention provides a detection agent for detecting the concentration of urea in water and its preparation method and detection method, wherein the detection agent includes reagent A and reagent B, the reagent A is a mixed acid; the reagent B is a color developing agent ; The mixed acid is a mixed solution of sulfuric acid, phosphoric acid and ammonium ferric sulfate, wherein the volume ratio of sulfuric acid and phosphoric acid is 2:0.9-2:1.1, and the concentration of ammonium ferric sulfate in the mixed solution is 0.5%-0.8%; The color developer is a mixed solution containing 0.2%-1.0% diacetyl monoxime and 0.2%-1.0% antipyrine.

Description

technical field [0001] The invention relates to a detection technology of urea concentration in water, which can be used for diacetyl monoxime-antipyrine method to measure the content of urea in water, and belongs to the technical field of chemical analysis. In particular, it relates to a detection agent for detecting urea concentration in water, a preparation method and a detection method thereof. Background technique [0002] For the discharge of urea produced by the human body, it is mainly discharged with urine, and part of it can be discharged with sweat. Since urea is easily soluble in water, it is irritating. Therefore, when the content of urea in the swimming pool is too high, it will cause swimmers Skin itching, flushing, erythema, scaling and other symptoms. On the other hand, when there are many people in the swimming pool, the sweat and urine of the swimmers will increase the urea content in the swimming pool. In view of this, the "Hygienic Standards for Swimmin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor 马丽
Owner SHANGHAI YIDIAN SCI INSTR
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