Titrimetric analysis method

A titration analysis and titration technology, applied in the direction of chemical analysis by titration method, can solve the problem of no titration method, and achieve the effect of strong versatility, simple operation and simple equipment

Inactive Publication Date: 2016-06-08
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, up to now, there is no titration method based on t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, calibrate the concentration of 3 HCl samples of about 0.500mol / L

[0015] Step 1. Prepare 20.0 mL of 1.000 mol / L NaOH standard titration solution and add it to the titration solution storage bottle.

[0016] Step 2: Prepare 0.350mol / L, 0.400mol / L, 0.450mol / L, 0.500mol / L, 0.550mol / L, 0.600mol / L and 0.650mol / L solutions of 1.0 mL.

[0017] Step 3. Insert a disposable glass reaction tube containing 0.50 mL of HCl of each standard concentration into a non-contact high-frequency electronic sensor (EDAQ Company, Australia, model ER225).

[0018] Step 4: Set the titration parameters to 2.0 μL / dispensing, with an interval of 20 s, and a total of 400 dispensing times; set the measurement parameters as excitation voltage 12 V, excitation frequency 2.0 MHz, recording period 0.5 s, and reaction temperature at room temperature.

[0019] Step 5. Use an automatic sample injector (model: AS-2902, Beijing Zhongyi Yusheng Technology Co., Ltd.) to distribute the standard N...

Embodiment 2

[0025] Embodiment two, titration 1 part of Cl in tap water - concentration

[0026] Step 1. Prepare 1.00mmol / L AgNO 3 Add 20.0mL of standard titrant to the titrant storage bottle.

[0027] Step 2: Prepare 1.0 mL each of 0.100 mmol / L, 0.150 mmol / L, 0.200 mmol / L, 0.250 mmol / L and 0.300 mmol / L solutions using NaCl standard substance.

[0028] Step 3: Insert the disposable glass reaction tubes containing 0.50 mL of NaCl of each standard concentration into the non-contact high-frequency electronic sensor.

[0029] Step 4: Set the titration parameters to 2.0 μL / dispensation with an interval of 30 s, a total of 200 dispensations; set the measurement parameters to 12 V excitation voltage, 2.0 MHz excitation frequency, 0.5 s recording period, and room temperature as the reaction temperature.

[0030] Step 5. Use a micro precision peristaltic pump for standard AgNO 3 Distribution of the titrant; insert the titration needle of a capillary glass tube with an alkylated end into the NaC...

Embodiment 3

[0036] Embodiment three, use EDTANa 2 Titrate 2 parts of PbSO with a marked concentration of about 5-6mmol / L 4 the solution

[0037] Step 1, prepare 10.00mmol / L of EDTANa 2 Add 20.0mL of standard titrant to the titrant storage bottle.

[0038] Step 2. Using PbSO 4 Prepare 1.00mL of 4.50mmol / L, 5.00mmol / L, 5.50mmol / L, 6.00mmol / L and 6.50mmol / L solutions of standard substances respectively.

[0039] Step 3, will be equipped with 0.40mL each standard concentration of PbSO 4 The disposable glass reaction tube is inserted into the non-contact high-frequency electronic sensor.

[0040] Step 4: Set the titration parameters to 4.0 μL / dispensing, with an interval of 30 s, and a total of 250 dispensing times; set the measurement parameters to 12 V excitation voltage, 2.0 MHz excitation frequency, 0.5 s recording period, and room temperature as the reaction temperature.

[0041] Step 5. Use a micro precision peristaltic pump for standard EDTANa 2 Dispensing of titrant; Insert the ...

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PUM

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Abstract

The invention relates to a titrimetric analysis method and belongs to the field of inorganic chemical analysis. The titrimetric analysis method comprises the following steps: preparing a standard titrating solution and a standard titrated solution; confirming the volume of a titrated solution sample, distribution rate of a titrating solution and working temperature; using a non-contact high-frequency electronic sensor for monitoring the change in conductivity of a reaction liquid in a titrimetric reaction in real time; taking an inflection point on a titration curve as a titration end point; establishing a relation function between the time required by reaching the titration end point and the concentration of the titrated solution; and measuring the titration time for reaching the titration end point of the to-be-measured sample under same parameters and substituting the titration time into the working curve, thereby acquiring the concentration data. The titrimetric analysis method is strong in universality and simple in operation; the electrode does not need to be exchanged and pretreated; the auxiliary facilities for stirring, controlling temperature, and the like, are not required in the titrating process; the method is applicable to four inorganic chemical reactions related to acid-base, sediment, complexing and redox; the sensitivity is high; and the method can be used for detecting the microliter-scale sample.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a multifunctional titration analysis method which only needs trace samples. Background technique [0002] Titration analysis, also known as capacity analysis, is widely used in the fields of chemistry, chemical industry, environmental science, food hygiene and life science. Usually, a standard solution of known concentration is added dropwise to the solution of the substance to be tested until the amount of the substance added is just reacted completely according to the stoichiometric relationship, and then calculated according to the concentration of the standard solution added and the volume consumed. Measure substance content. In recent years, the automatic titration methods based on optical technology or electrochemical technology have been greatly developed. For example, the patent CN201510172304.0 discloses an automatic acid-base titrator, which uses a micro...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 赵俊曲克明张旭志丁东生张艳黄梦诗陈聚法
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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