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Application of filter paper adsorbent to direct electrochemical detection of lead in water sample

A filter paper, electrochemical technology, applied in the direction of material electrochemical variables, etc.

Inactive Publication Date: 2011-09-14
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There is no literature report on the use of filter paper adsorption reagents for electrochemical direct detection of lead in water samples

Method used

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  • Application of filter paper adsorbent to direct electrochemical detection of lead in water sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1. Utilize the filter paper piece adsorption reagent to be used in the method for the direct detection of lead in the water sample electrochemically, measure the lead content in the water sample.

[0016] Take Waterman No.1 filter paper, use a puncher to take out a disc with a diameter of about 7 mm, then add 10 microliters of acetic acid buffer solution (pH 4.5) to the filter paper dropwise, dry at room temperature, and then add 10 microliters of 500ppb bismuth nitrate solution and dried at room temperature. Before the measurement, the filter paper sheet was covered on the surface of the screen printing electrode (Gwent group, Torfaen, United Kingdom), and 10 microliters of water samples with a known lead content of 20ppb were added dropwise on the filter paper, according to the electrochemical anodic stripping method. Voltammetric measurement, frequency 20Hz; potential amplitude 5mV; electrochemical deposition at -1.40V for 120s, equilibration time 30s. An...

Embodiment 2

[0019] Get known lead content and be that 10 microliters of water samples of 10ppb are dripped on the filter paper, measure according to electrochemical anodic stripping voltammetry, other are all the same as embodiment 1, the lead measurement result in the water sample is 9.4ppb, measure The error is 6%.

Embodiment 3

[0021] It is known that 10 microliters of water samples with a lead content of 100 ppb are added dropwise on the filter paper, and are measured according to electrochemical anodic stripping voltammetry. Others are the same as in Example 1. The lead measurement result in the water samples is 97.6 ppb, and the measurement error was 2.4%.

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Abstract

The invention discloses application of a filter paper adsorbent to direct electrochemical detection of lead in a water sample. The application is realized by adopting the steps of: punching Waterman No.1 filter paper to obtain a round paper sheet with the diameter of about 7mm through a puncher, then dripping 10 microlitre of an acetic acid buffer solution (with the pH value of 4.5) to the filer paper, drying at room temperature, then adding 10 microlitre of 500ppb bismuth nitrate solution, and drying at room temperature; before measurement, covering the filter paper on the surface of a screen printing electrode (Gwent group, Torfaen, United Kingdom), dripping 10 microlitre of water sample on the filter paper, and measuring with the frequency of 20Hz and the potential amplitude of 5mV according to an electrochemical anodic stripping voltammetry; depositing for 120s under -1.40V in an electrochemical way, and balancing for 30s; and carrying out anodic scanning from -1.40V to -0.40V, wherein before each measurement, stopping for 60s under +0.50V to clean the electrode. The method is used for determining the lead below 100ppb and has the errors within 6%.

Description

technical field [0001] The invention relates to a filter paper adsorption reagent used for electrochemical direct detection of lead in water samples. Specifically, by adsorbing the reagent in a filter paper sheet and then drying it, and then covering it on the surface of a screen-printed electrode, the lead content in water can be directly measured after adding the sample. Background technique [0002] Fast, cheap, convenient and simple sensors are the current research hotspots in analytical chemistry. These devices are mainly used in on-site inspections that do not require high operator skills. For analytical chemical detection, various reagents need to be added during the test process, which is a great challenge for fast and convenient on-site sensing. [0003] Filter paper has many advantages: (1) It is a cheap and easy-to-mass-produced renewable energy; (2) It is easy to be used for printing, surface modification and adsorption of reagents or biomolecules; (3) It has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/26
Inventor 范大和王伟方海林郑虎祥王卉
Owner YANCHENG INST OF TECH
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