CN104267076A - Detection method for trace lead in water - Google Patents
Detection method for trace lead in water Download PDFInfo
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- CN104267076A CN104267076A CN201410511642.8A CN201410511642A CN104267076A CN 104267076 A CN104267076 A CN 104267076A CN 201410511642 A CN201410511642 A CN 201410511642A CN 104267076 A CN104267076 A CN 104267076A
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Abstract
The invention relates to a detection method for trace lead in water and belongs to the field of detection on environmental samples. The detection method comprises the following steps: (1) adding deionized water, acetic acid and sodium acetate into a beaker, inserting three electrodes of a potential dissolution instrument, and measuring the blank peak height values; then adding a standard lead solution by using a microinjector in sequence, respectively recording the peak height values and making a standard curve for the content of the lead according to the peak height values; and (2) filtering a water sample by using fast and quantitative filtering paper, removing particles in the water sample, requiring another water sample I, then adding the acetic acid and the sodium acetate into the water sample I, inserting the three electrodes of the potential dissolution instrument, measuring the peak height values and calculating the content of the trace lead according to a standard curve. The detection method has the advantage that a differential potential dissolution method is adopted for measuring the trace lead in the water, is simple and easy to implement, high in sensitivity, good in recovery rate and precision, high in speed and low in cost and can be used as a measuring method for the trace lead in the water to be promoted and used in an environmental monitoring station.
Description
Technical field
The present invention relates to the detection method of micro lead in a kind of water, belong to environmental analysis method field.
Background technology
Lead is a kind of accumulation property poisonous substance, is easily absorbed by stomach, is affected the metabolism of enzyme and cell by blood.The absorption of excessive lead will have a strong impact on the health of people, and major toxicity is lacked of proper care and injury of kidney for causing anaemia, nervous function.The many pollutions from the waste water such as mining, metallurgy, chemical industry, plating of lead in natural water, use the plastic tube of leaded high pipeline or lead-containing compounds as running water pipe, Pb in Drinking Water content can be made to increase.China's " drinking water sanitary standard " specifies, in the day water and Drinking Water, lead tolerance can not more than 0.05mg/L.Therefore, the content in plumbous content, particularly environmental water sample is in the environment the important indicator that environmental monitoring controls.In existing National Environmental standard monitoring method, the mensuration of regulation water quality lead has dithizone spectrophotometry and atomic absorption spectrophotometry, the most low energy of concentrations reaches 10 μ g/L, but because in water, lead content is lower, these methods still can not meet the mensuration requirement of Determination of Trace Lead in Environmental Samples.
Therefore, the detection method studying micro lead in the water that a kind of accuracy is high, repeatability is high, easy and simple to handle, detection limit is low is necessary.
Summary of the invention
The present invention aims to provide the detection method of micro lead in the water that a kind of accuracy is high, repeatability is high, easy and simple to handle, detection limit is low.
The detection method of micro lead in water of the present invention, comprises the following steps:
(1) get 50mL small beaker 1, add deionized water 25.0mL, 0.5mol/L acetic acid 8mL, 0.5mol/L sodium acetate 17.0mL, insert three electrodes of potential digestion instrument, survey blank peak height; Then 10.0 μ g/mL plumbous standard solution 10.0 μ L, 20.0 μ L, 50.0 μ L, 100.0 μ L, 200.0 μ L, 300.0 μ L, 400.0 μ L, 500.0 μ L are added successively with micro syringe, record peak height respectively, this standard solution is equivalent to lead content and is respectively: 0.0,0.1,0.2,0.5,1.0,2.0,3.0,4.0,5.0 μ g make typical curve with the content of peak height value to lead.
(2) water sample fast quantification Filter paper filtering, removing particle wherein, gets 25ml water sample 50mL small beaker, then adds 0.5mol/L acetic acid 8mL, 0.5mol/L sodium acetate 17.0mL, insert three electrodes of potential digestion instrument, measure its peak height and calculate its content according to typical curve.
Preferably, the upper boundary potential-0.90V of potential digestion instrument of the present invention when measuring, bottom boundary potential-0.20V, electrolytic potential-1.10V, mixing time 60 seconds, 30 seconds rest times, sensitivity S=10-3O.
Detection method of the present invention, adopt Differential Potentiometric Stripping Analysis with Experimental, Differential Potentiometric Stripping Analysis with Experimental is a kind of Analytical Methods of Trace that the seventies, Later development got up, its cardinal principle is: be deposited on by Hg2+ and Pb2+ in the silver electrode being coated with mercury film in advance on preliminary election electrode potential, disconnect potentiostatic circuit, then make deposition Pb2+ on the working electrode (s, with amalgam again solution-off, draw potential-time curve, carry out quantitative measurement.In this method, determine dissolved corrosion plumbous on plating mercury, argental mercury electrode, when PH is 3.0-6.0, in sodium acetate-acetic acid solution, plumbous stripping current potential is-0.445V, have good stripping peak shape, and establish the method with micro lead in differetial-potential stripping argental mercury electrode analysis air and water, this method overcomes the trouble that glass-carbon electrode method plates mercury repeatedly.By carrying out recovery test to four parts of water samples, its recovery is all more than 90%, and the coefficient of variation is less than 10%, and therefore this method has good precision and accuracy.
Detection method of the present invention, adopts Differential Potentiometric Stripping Analysis with Experimental, measure that micro lead in water is simple, highly sensitive, the recovery and precision good, and speed is fast, cost is low, can promote the use of in environmental monitoring station as the assay method of water micro lead.
Embodiment
Embodiment one:
(1) 50mL small beaker 1 is got, add deionized water 25.0mL, 0.5mol/L acetic acid 8mL, 0.5mol/L sodium acetate 17.0mL, insert three electrodes of potential digestion instrument (during mensuration, upper boundary potential-0.90V, bottom boundary potential-0.20V, electrolytic potential-1.10V, mixing time 60 seconds, 30 seconds rest times, sensitivity S=10-3O), survey blank peak height; Then 10.0 μ g/mL plumbous standard solution 10.0 μ L, 20.0 μ L, 50.0 μ L, 100.0 μ L, 200.0 μ L, 300.0 μ L, 400.0 μ L, 500.0 μ L are added successively with micro syringe, record peak height respectively, this standard solution is equivalent to lead content and is respectively: 0.0,0.1,0.2,0.5,1.0,2.0,3.0,4.0,5.0 μ g make typical curve with the content of peak height value to lead.
(2) water sample fast quantification Filter paper filtering, removing particle wherein, gets 25ml water sample 50mL small beaker, then adds 0.5mol/L acetic acid 8mL, 0.5mol/L sodium acetate 17.0mL, insert three electrodes of potential digestion instrument, measure its peak height and calculate its content according to typical curve.
Embodiment two: the mensuration of actual water sample
Detect by detection method of the present invention, testing result as shown in Table-1.
Table-l testing result
。
Claims (2)
1. the detection method of micro lead in water, comprises the following steps:
(1) get 50mL small beaker 1, add deionized water 25.0mL, 0.5m0l/L acetic acid 8mL, 0.5m0l/L sodium acetate 17.0mL, insert three electrodes of potential digestion instrument, survey blank peak height; Then 10.0 μ g/mL plumbous standard solution 10.0 μ L, 20.0 μ L, 50.0 μ L, 100.0 μ L, 200.0 μ L, 300.0 μ L, 400.0 μ L, 500.0 μ L are added successively with micro syringe, record peak height respectively, this standard solution is equivalent to lead content and is respectively: 0.0,0.1,0.2,0.5,1.0,2.0,3.0,4.0,5.0 μ g make typical curve with the content of peak height value to lead;
(2) water sample fast quantification Filter paper filtering, removing particle wherein, gets 25ml water sample 50mL small beaker, then adds 0.5m0l/L acetic acid 8mL, 0.5m0l/L sodium acetate 17.0mL, insert three electrodes of potential digestion instrument, measure its peak height and calculate its content according to typical curve.
2. the detection method of micro lead in water as claimed in claim 1, is characterized in that the upper boundary potential-0.90V of described potential digestion instrument when measuring, bottom boundary potential-0.20V, electrolytic potential-1.10V, mixing time 60 seconds, 30 seconds rest times, sensitivity S=10-30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410511642.8A CN104267076A (en) | 2014-09-29 | 2014-09-29 | Detection method for trace lead in water |
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| CN201410511642.8A CN104267076A (en) | 2014-09-29 | 2014-09-29 | Detection method for trace lead in water |
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| CN104267076A true CN104267076A (en) | 2015-01-07 |
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| CN201410511642.8A Pending CN104267076A (en) | 2014-09-29 | 2014-09-29 | Detection method for trace lead in water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017121345A1 (en) * | 2016-01-15 | 2017-07-20 | 刘文涛 | Improved electrochemical analysis method and use |
| US10677790B2 (en) | 2016-07-20 | 2020-06-09 | City University Of Hong Kong | Optochemical detector and a method for fabricating an optochemical detector |
-
2014
- 2014-09-29 CN CN201410511642.8A patent/CN104267076A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017121345A1 (en) * | 2016-01-15 | 2017-07-20 | 刘文涛 | Improved electrochemical analysis method and use |
| US10677790B2 (en) | 2016-07-20 | 2020-06-09 | City University Of Hong Kong | Optochemical detector and a method for fabricating an optochemical detector |
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Application publication date: 20150107 |
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| WD01 | Invention patent application deemed withdrawn after publication |