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Method for detecting 1-hydroxy ethylene-1, 1-diphosphonic acid

A technology of hydroxyethylidene diphosphonic acid and detection method, which is applied in chemical analysis by titration, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the color mutation Inconspicuous, operator and environmental hazards, low detection sensitivity and accuracy, etc., to achieve the effect of less reagent consumption, no radioactive pollution, and elimination of suspended particulate matter

Inactive Publication Date: 2005-09-21
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection sensitivity and accuracy of this method are low. In the process of titrating the sample solution with thorium nitrate standard solution, the color of the solution changes from orange to carmine, then to rose red, and then to purplish red. The color mutation is not obvious, and the determination of the end point is often due to varies from person to person
And because thorium is a radioactive element, it has great harm to operators and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Standard curve drawing: prepare simulated water samples (in which HEDP concentrations are 1.00, 2.00, 3.00, 4.00, 5.00mg / L, Ca 2+ , Mg 2+ Each concentration is 200mg / L, Fe 2+ , Zn 2+ Each concentration is 3mg / L, Al 3+ The concentration is 2mg / L). After pretreatment with a cation-exchange column (1g of cation-exchange resin filled in a chromatographic column with an inner diameter of 1cm and a length of 20cm, and a small amount of glass fiber at both ends of the column), take 7.5mL and add 1.25mL of buffer, masking and indicator solution (including acetic acid The concentration of sodium is 0.175mol / L, the concentration of glacial acetic acid is 0.025mol / L, the concentration of o-phenanthroline is 200mg / L, the concentration of fluoride ion is 100mg / L, and the concentration of xylenol orange is 0.02mmol / L), adding 0.2mL of lanthanum nitrate solution with a concentration of 0.0625mmol / L, stirred and mixed after each dropwise addition, and measured the absorbance of the...

Embodiment 2

[0016] With method of the present invention and phosphomolybdenum blue spectrophotometry (with reference to national standard), detect the water sample of the circulating cooling water that runs in the dynamic simulation device of certain water quality stabilizer factory simultaneously. After the water sample is pretreated by a cation exchange column (fill 1g of cation exchange resin in a chromatographic column with an inner diameter of 1cm and a length of 20cm, and fill a small amount of glass fiber at both ends of the column), take 7.5mL and add buffer, masking and indicator solution 1.25 mL (the concentration of sodium acetate is 0.175mol / L, the concentration of glacial acetic acid is 0.025mol / L, the concentration of o-phenanthroline is 200mg / L, the concentration of fluoride ion is 100mg / L, and the concentration of xylenol orange is 0.02mmol / L) , gradually quantitatively add 0.2mL of lanthanum nitrate solution with a concentration of 0.0625mmol / L, stir and mix after each dro...

Embodiment 3

[0021]Accurately dilute the product to be tested by 50,000 times, add buffer, masking and indicator solution 1.33mL (in which the concentration of sodium acetate is 0.175mol / L, the concentration of glacial acetic acid is 0.025mol / L, and o-phenanthroline is added to 10mL of the diluted product solution. Concentration of 200mg / L, fluoride ion concentration of 100mg / L, xylenol orange concentration of 0.02mmol / L), quantitatively add 0.2mL of lanthanum nitrate solution with a concentration of 0.25mmol / L successively, stir and mix after each dropwise addition , Measure the absorbance of the solution at a wavelength of 570 nm. According to the change in the volume of the test solution after adding the titrant, correct the absorbance, make a titration curve for the relationship between the corrected absorbance and the amount of the titrant solution added, and obtain the titrant volume V=21.1mL corresponding to the inflection point of the titration curve. According to the standard work...

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Abstract

This invention relates to hydroxyl-ethidene diphosphoric acid test method, which comprises the following steps: adding buffer, shield and indicating agents into the HEDP solution and dripping solution to test the light absorption degree and make dripping curve and figure out dripping agent volume V and make standard working curve; adding buffer, shield and indicative agents in the sample to test light absorption degree to make dripping curve and to figure out volume Vx, and to figure out the HEDP concentration by the standard working curve; the concentration degree multiplies the diluting times to get the effective content of HEDP.

Description

technical field [0001] The invention relates to a method for detecting the active ingredient content of hydroxyethylidene diphosphonic acid (HEDP) and HEDP products in industrial circulating cooling water. Background technique [0002] Hydroxyethylidene diphosphonic acid (HEDP) is the main component of water quality stabilizer in industrial circulating cooling water. At present, the determination method of HEDP in circulating cooling water is phosphorous molybdenum blue or phosphorous vanadium molybdenum yellow spectrophotometry; the determination method of active ingredient content in HEDP products is thorium nitrate complexometric titration. The phosphorous molybdenum blue or phosphorous vanadium molybdenum yellow spectrophotometric method uses a strong oxidant such as ammonium persulfate or potassium permanganate, heats and digests, decomposes organic phosphate into orthophosphate, and then performs spectrophotometric determination according to the determination method of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N31/16
Inventor 刘宝敏马剑袁东星金晓英孔祥海孙晓珑郝玉凤
Owner XIAMEN UNIV
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