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Method for determining total phosphorus in water by using ammonium molybdate spectrophotometry method

A spectrophotometry, ammonium molybdate technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of time-consuming, complicated and laborious operation, and achieve the effect of shortening the time required for the reaction, reducing the amount of operation, and saving costs.

Inactive Publication Date: 2017-11-21
安徽宏远职业卫生技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the determination of total phosphorus in water is mainly carried out according to the method of GB / T11893-1989. It uses an electric high-pressure steam sterilizer to digest the water sample, and the sampling volume is 25mL. This method has the problems of complicated operation, time-consuming and laborious. needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for ammonium molybdate spectrophotometric determination of total phosphorus in water, comprising the steps:

[0029] (1) Draw a standard curve:

[0030] a. Pipette 0.0, 0.25, 0.50, 1.00, 2.00, 3.00mL of phosphorus standard solution into 6 total phosphorus digestion tubes with a 5mL graduated pipette, and then add 5.00, 4.75, 4.50, 4.00, 3.00, 2.00mL of pure standby after water;

[0031] b. Add 1.00mL 40g / L potassium persulfate solution to each of the above digestion tubes, shake well and set aside;

[0032] c. Put the digestion tubes processed in operation b into the sealed tank. At this time, raise the pressure in the sealed tank to 0.3 MPa, and raise the temperature in the sealed tank to 90°C. After 15 minutes of digestion with heat preservation and pressure Take out spare;

[0033] d. Cool the digestion tubes treated in operation c to room temperature under natural conditions, then add 0.20mL of 10% ascorbic acid solution, shake well and let stand for 30s...

Embodiment 2

[0047] A method for ammonium molybdate spectrophotometric determination of total phosphorus in water, comprising the steps:

[0048] (1) Draw a standard curve:

[0049] a. Pipette 0.0, 0.25, 0.50, 1.00, 2.00, 3.00mL of phosphorus standard solution into 6 total phosphorus digestion tubes with a 5mL graduated pipette, and then add 5.00, 4.75, 4.50, 4.00, 3.00, 2.00mL of pure standby after water;

[0050] b. Add 1.00mL 40g / L potassium persulfate solution to each of the above digestion tubes, shake well and set aside;

[0051] c. Put the digestion tubes processed in operation b into the sealed tank. At this time, raise the pressure in the sealed tank to 0.3MPa, and raise the temperature in the sealed tank to 92°C. After digestion with heat preservation and pressure for 15 minutes Take out spare;

[0052]d. Cool the digestion tubes treated in operation c to room temperature under natural conditions, then add 0.20mL of 10% ascorbic acid solution, shake well and let stand for 30s,...

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Abstract

The present invention discloses a method for determining the total phosphorus in water by using an ammonium molybdate spectrophotometry method. The method comprises: (1) drawing a standard curve; (2) determining a sample; and (3) calculating the total phosphorus. According to the present invention, only the 5.0 mL sample is required during the sampling, such that the sampling volume is reduced to 20%, and the corresponding reagent consumption required by the reaction is reduced to 20% sp as to well save the cost and reduce the operation amount; the heating temperature is reduced through the proper pressurization during the digestion, and the catalytic reaction process is assisted with ultrasonic waves, such that the time consumption required by the reaction is shortened under the co-treatment; and the method has advantages of time saving, labor saving and effectively-ensured test precision, and meets the quality requirement.

Description

technical field [0001] The invention belongs to the technical field of water quality detection, and in particular relates to a method for determining total phosphorus in water by ammonium molybdate spectrophotometry. Background technique [0002] In natural water and wastewater, phosphorus exists almost in the form of various phosphates, which are divided into orthophosphates, condensed phosphates (pyrophosphates, metaphosphates and polyphosphates) and organically bound phosphates, which Exist in solution, in humus particles or in aquatic organisms. [0003] Phosphate content in natural water is relatively small, and industrial wastewater and raw water sewage from industries such as chemical fertilizers, smelting, and synthetic detergents often contain relatively large amounts of phosphorus. Phosphorus is one of the essential elements for biological growth, but excessive phosphorus content in water (more than 0.2mg / L) can cause excessive algae reproduction until the number ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 夏怀翔赵华芝严章飞孔玉萍张强方栋段志祥
Owner 安徽宏远职业卫生技术服务有限公司
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