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Method for analyzing total phosphorus content in sample

A phosphorus content and sample technology, applied in the field of analysis of total phosphorus content in samples, can solve problems such as poor accuracy and large influence of human operation errors, and achieve the effects of easy mastery, improved accuracy and precision, and unified heating end point

Active Publication Date: 2007-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of poor accuracy and large influence of human operation error in the method for analyzing total phosphorus in the prior art, and provide a method for analyzing total phosphorus in the analysis sample with good accuracy and little influence of human operation error. Total Phosphorus Method

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  • Method for analyzing total phosphorus content in sample
  • Method for analyzing total phosphorus content in sample
  • Method for analyzing total phosphorus content in sample

Examples

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Effect test

Embodiment 1

[0038] The following examples illustrate the drawing of the standard curve and the calculation method of the total phosphorus content.

[0039] (1) Preparation of phosphorus standard solution

[0040] Weigh 0.7165 g of potassium dihydrogen phosphate that has been dried to constant weight at 105°C, dissolve it in 500 ml of water, transfer the resulting solution to a 1-liter volumetric flask, dilute to volume with water, and shake well to obtain a concentration of 0.5 mg / ml PO 4 3- Phosphorus standard stock solution. Take 20.00 milliliters of phosphorus standard mother solution in a 500.00 milliliter volumetric flask, dilute to volume with water, and shake well to obtain a concentration of 0.02 mg / ml PO 4 3- phosphorus standard solution.

[0041] (2) preparation of ascorbic acid solution

[0042] Weigh 10.00 grams of ascorbic acid and 0.20 grams of disodium edetate (C 10 h 14 o 8 N 2 Na 2 2H 2 O), dissolve in 200.00 ml of water, add 8.00 ml of formic acid, dilute to ...

Embodiment 2

[0055] This example illustrates the method for analyzing total phosphorus in a sample provided by the present invention.

[0056] (1) Preparation of total phosphorus standard solution

[0057] Take 10.00 milliliters of water ammonia nitrogen, nitrate nitrogen, total phosphorus secondary analysis standard material (liquid) (National Bureau of Quality and Technical Supervision GBW (E) 080431, the total phosphorus content is recorded as 999.8 mg / L ± 4.999 mg / L in P) to In a 1000ml volumetric flask, dilute to volume with water and mix well to obtain 4 3- Total phosphorus standard solution of 30.66 mg / L ± 0.1533 mg / L.

[0058] (2) Determination of total phosphorus

[0059] Take 5.00 milliliters of the above-mentioned total phosphorus standard solution in 8 marked 250 milliliter conical flasks respectively, add 2 milliliters of nitric acid (concentration is 19 mol / liter), 1 milliliter of perchloric acid (concentration is 12 mol / liter), set Boil slowly on an electric stove until ...

Embodiment 3

[0068] This example illustrates the precision of this method for analyzing a single agent for phosphorus-containing water treatment.

[0069] Prepare RP-85 phosphorus-based water treatment agent (PBTC) (solid content ≥ 50%, total phosphorus ≥ 17%, produced by Beijing Linhua Water Stabilizer Factory, batch number 20040803) with deionized water to prepare a 40 mg / L sample solution . Get 10.00 milliliters of samples respectively in 9 marked 250 milliliters conical flasks, add 1 milliliter of nitric acid (19 mol / liter), 2 milliliters of perchloric acid (12 mol / liter), the add-on of above-mentioned two kinds of acidic compounds makes The weight ratio of the acidic compound to the sample to be tested is 3.6:10. The Erlenmeyer flask filled with the above mixed solution was placed on an adjustable electric furnace and slowly boiled until the solution was evaporated to dryness, and then started timing. After continuing to heat for 30 minutes, it was naturally cooled to room temperatur...

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Abstract

A method for analyzing the content of total phosphorus is disclosed that includes following steps: (1) the sample to be detected is mixed with the splitter, and heat the mixture to dry completely, said splitter is acidic compound solution with strong oxidation; (2) the dried production is dissolved by the acidic solution; (3) the production produced in the step (2) is mixed with the molybdenate or molybdenate solution; (4) the production produced in the step (3) is mixed with deoxidizer or deoxidizer solution to do color reaction; (5) the content of phosphorus, molybdenum and blueness in the mixture obtained in the step (4) by the spectrophotometric method. Following the method provided by the invention you can analyze the total phosphorus in the sample, because heating uniformly, it can reduce the incorrectness resulted by the man-made operation error; at the same time the poly-phosphate is converted into potassium orthophosphate, the total phosphorus can be test which can not be test by the conventional method, so the invention can improve the accuracy and precision.

Description

technical field [0001] The invention relates to a method for analyzing the total phosphorus content in a sample. Background technique [0002] The analysis and determination of total phosphorus is widely used in industry. For example, the determination of total phosphorus in sewage can monitor the environment, and the treatment effect of industrial circulating water can be reasonably controlled through total phosphorus. In order to solve the scaling and corrosion problems of industrial circulating cooling water in heat exchange equipment, phosphorus-containing water treatment single agent or compound agent is widely used to treat circulating water. However, the industrial circulating water added with phosphorus-containing treatment agents will aggravate the pollution and eutrophication of environmental waters when discharged. In addition, if the phosphorus-containing water treatment agent stays in the industrial circulating cooling system for too long, it will form calcium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/25G01N1/28
Inventor 余正齐罗咏涛李本高
Owner CHINA PETROLEUM & CHEM CORP
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