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A rapid on-site detection method of iron ions in water that can eliminate the influence of reagent blank

A detection method and technology for iron ions, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of difficult to effectively control the dissolution time and inability to eliminate reagent blanks, etc. Achieve high accuracy, easy operation, and eliminate effects

Active Publication Date: 2018-02-16
WENZHOU MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a rapid on-site detection method for iron ions in water that can eliminate the influence of reagent blanks, so as to realize rapid and accurate on-site determination of iron ions in water, and overcome the problem of dissolution time when using dry powder detection reagents in the prior art Due to the difference, it is difficult to effectively control the detection time. Because the standard color card that does not deduct the reagent blank is used, the standard color card is directly compared with the sample tube to obtain the result during color comparison, and the fluctuation of the reagent blank cannot be eliminated, which will adversely affect the accuracy of the test result. Shortcomings

Method used

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  • A rapid on-site detection method of iron ions in water that can eliminate the influence of reagent blank
  • A rapid on-site detection method of iron ions in water that can eliminate the influence of reagent blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Weigh 0.15g 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, 2g anhydrous sodium sulfite, 50g vitamin C, 10g thiourea, add 800ml 60mmol / L pH3.5 acetic acid -Sodium acetate buffer solution was stirred and dissolved, then 0.1ml Tween-80 and 30ml ethylene glycol were added, stirred and dissolved, and the volume was adjusted to 1000ml with 60mmol / L pH3.5 acetic acid-sodium acetate buffer solution to obtain 1000ml containing 0.15g / L2 -(5-bromo-2-pyridylazo)-5-diethylaminophenol, 0.1ml / L Tween-80, 2g / L anhydrous sodium sulfite, 50g / L vitamin C, 10g / L thiourea, 30ml / 60mmol / L pH 3.5 acetic acid-sodium acetate buffer solution of L ethylene glycol is a liquid iron ion detection reagent;

[0040] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Concentration of 0.06mg / L, 0.12mg...

Embodiment 2

[0046] Step 1. Weigh 0.20g 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, 6g anhydrous sodium sulfite, 75g vitamin C, 15g thiourea, add 800ml 60mmol / L pH3.5 acetic acid Stir to dissolve sodium acetate buffer, then add 0.3ml Tween-80, 50ml ethylene glycol, stir and dissolve, then dilute to 1000ml with 60mmol / L pH3.5 acetic acid-sodium acetate buffer to obtain 1000ml containing 0.20g / L 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, 0.3ml / L Tween-80, 6g / L anhydrous sodium sulfite, 75g / L vitamin C, 15g / L thiourea, 50ml 60mmol / L pH 3.5 acetic acid-sodium acetate buffer solution of / L ethylene glycol is a liquid iron ion detection reagent;

[0047] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Concentration of 0.06mg / L, 0.12mg / L, 0.18mg / L, 0.24mg / L, 0.30mg / L, 0.36mg / L iron ion standa...

Embodiment 3

[0053] Step 1. Weigh 0.25g 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, 10g anhydrous sodium sulfite, 100g vitamin C, 20g thiourea, add 800ml 60mmol / L pH3.5 acetic acid Stir to dissolve sodium acetate buffer, then add 0.5ml Tween-80 and 70ml ethylene glycol, stir and dissolve, then dilute to 1000ml with 60mmol / L pH3.5 acetic acid-sodium acetate buffer to obtain 1000ml containing 0.25g / L 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, 0.5ml / L Tween-80, 10g / L anhydrous sodium sulfite, 100g / L vitamin C, 20g / L thiourea, 70ml 60mmol / L pH 3.5 acetic acid-sodium acetate buffer solution of / L ethylene glycol is a liquid iron ion detection reagent;

[0054] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Concentration of 0.06mg / L, 0.12mg / L, 0.18mg / L, 0.24mg / L, 0.30mg / L, 0.36mg / L iron ion...

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Abstract

The invention discloses an on-site rapid detection method for iron ions in water capable of eliminating the influence of reagent blanks. The method prepares a liquid-type iron ion detection reagent, deducts the blank color of the reagent, and manufactures a standard color card with a transparent plastic plate as a supporting material. , Superimpose the color of the blank tube on the standard color card and compare it with the sample tube during detection, which has the advantages of simple method, high accuracy, and easy operation; using liquid iron ion detection reagent for detection can effectively control the entire detection process. It takes time; by superimposing the color of the blank tube on the standard color card and then comparing it with the sample tube for color comparison, it can effectively eliminate the adverse effects of reagent blank fluctuations on the accuracy of the test results, especially suitable for rapid on-site detection of iron ions in water .

Description

technical field [0001] The invention belongs to the field of water quality detection, and in particular relates to an on-site rapid detection method for iron ions in water which can eliminate the influence of reagent blanks. Background technique [0002] Iron (Fe) is an essential trace element for the human body. It has many physiological functions in the human body. In daily life, the human body absorbs trace elements through drinking water in a corresponding proportion. The detection of iron ion content is a detection item stipulated in the national drinking water standard. [0003] The detection of iron ions in water mostly uses atomic absorption spectrophotometry, visible light spectrophotometry, inductively coupled plasma atomic emission spectrometry / mass spectrometry, electrochemical analysis, etc. Professional operators and technicians complete the test, most of the methods still need expensive large-scale special instruments, which cannot meet the requirements of fas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 连国军
Owner WENZHOU MEDICAL UNIV
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