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Full solid Pb ion selecting electrode and its preparing method

An ion-selective electrode, all-solid-state technology, applied in the field of electrodes, can solve the problems of inconvenient portability, complex pretreatment, long measurement cycle, etc., and achieve the effects of easy portability, strong corrosion resistance, and fast measurement.

Inactive Publication Date: 2009-01-21
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment using these methods is huge, inconvenient to carry, expensive, requires complex pretreatment, long measurement cycle and requires skilled operators, which brings many difficulties and inconveniences to practical applications

Method used

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  • Full solid Pb ion selecting electrode and its preparing method
  • Full solid Pb ion selecting electrode and its preparing method
  • Full solid Pb ion selecting electrode and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] From figure 1 Visible, all-solid-state Pb ion selective electrode of the present invention, it is provided with all-solid-state Pb ion by epoxy (polyethylene, hereinafter the same) resin tube (cylindrical or square cylinder) 1, this resin tube 1 lower orifice Small column-shaped sensitive material 2 (back cover), on the upper surface of the small cylinder with silver paste through welding a copper wire 3, the upper nozzle is provided with resin cover composition; copper wire 3 from the resin cover Draw; above-mentioned all-solid-state solid-state Pb ion small columnar sensitive material is made of sensitive spectrum pure compound PbS, As to Pb ion 2 S 3 And AgI, mixed with a molar ratio of 50:20:30.

[0021] The preparation of a kind of all-solid-state Pb ion selective electrode of the present invention:

[0022] (1) Preparation of Pb ion sensitive material and its all-solid Pb ion small columnar sensitive material

[0023] Select spectrally pure compounds PbS, As ...

Embodiment 2～3

[0027] In addition to the selected spectroscopically pure compounds PbS, As 2 S 3 Except that the mol ratio with AgI is different from that of Example 1 (see table 1 below), the rest of the preparation process, steps and process conditions thereof, etc. are all the same as in Example 1. The spectroscopically pure compounds used in Examples 1 to 3 and their amounts (mol), and the height / width ratio of small cylinders are listed in the following table 1:

[0028] Spectrum pure compound and its consumption (mol) selected in each embodiment of table 1

[0029]

[0030] The selectivity principle of the all-solid-state Pb ion-selective electrode:

[0031] The Pb ions in the small column-shaped sensitive material in the all-solid-state Pb ion selective electrode and the Pb ions in the solution produce ion exchange reactions.

[0032] The characteristics of the all-solid-state Pb ion selective electrode of the present invention:

[0033] The standard curve of this electrode to ...

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Abstract

The solid Pb ion selecting electrode consists of resin tube, small resin tube bottom column of Pb ion sensitive material, copper wire and resin cover. The making process of the solid Pb ion selecting electrode includes the following steps: mixing spectroscopically pure PbS, As2S3 and AgI in certain molar ratio, grinding the mixture, forming, heating in dry nitrogen inside a quartz bottle at 550 deg.C for 3 hr; naturally annealing, grinding, forming small column, heating in a vacuum quartz bottle at 550 deg.C for 3 hr; naturally annealing, and polishing to prepare Pb ion sensitive column; welding one wire with conducting silver paste to the column and setting the column to the bottom of the resin tube, and covering with resin cover to obtain the solid Pb ion selecting electrode. The electrode is portable and used in fast accurate detection of Pb ion in water, serum, vegetable, fruit, etc.

Description

technical field [0001] The invention belongs to an electrode used in the field of analysis, relates to an electrode used for detecting Pb ions, in particular to an all-solid-state Pb ion selective electrode for detecting Pb ions and a preparation method of the electrode. Background technique [0002] It is well known that heavy metal ions (such as Zn 2+ , Pb 2+ 、Cd 2+ 、Cu 2+ 、Cr 6+ , Mn 5+ 、As 3+ , Fe 3+ , Hg 2+ ) exceeding the standard can have harmful or even fatal effects on the human body. Therefore, the quantitative detection of heavy metals is of great significance in medicine, food, clinical and environmental monitoring. The current detection methods mainly include atomic absorption spectrophotometry and mass spectrometry. However, the equipment using these methods is huge, inconvenient to carry, expensive, requires complex pretreatment, long measurement cycle and requires skilled operators, which brings many difficulties and inconveniences to practical appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333G01N27/00
Inventor 门洪王建国
Owner NORTHEAST DIANLI UNIVERSITY
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