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Method for determining total phosphorus content in water

A technology for phosphorus content and water determination, applied in the field of phosphorus content detection, can solve problems such as affecting the measurement results of total phosphorus content in samples, unfavorable laboratory batch inspection and detection, and strict time requirements, so as to improve test efficiency and save operation steps. , the effect of increasing the test accuracy

Pending Publication Date: 2021-01-01
中化地质矿山总局地质研究院
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Problems solved by technology

[0003] The above methods all use ammonium molybdate spectrophotometry or phosphomolybdenum blue spectrophotometry, which require the preparation of chromogenic reagents and buffers, and have strict time requirements. If the reaction time of the standard curve and the sample is inconsistent, it will affect the quality of the sample. Measurement results of total phosphorus content in
Moreover, when the sample volume is large, it is limited by time, equipment, personnel and other conditions, and the efficiency is very low, which is not conducive to laboratory batch inspection and testing

Method used

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  • Method for determining total phosphorus content in water

Examples

Experimental program
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Embodiment 1

[0043] The present embodiment provides a method for measuring total phosphorus content in water, comprising the steps of:

[0044] (1) Digestion: Take 25mL of the water sample to be tested and put it into a 100mL beaker, add 1mL of sulfuric acid and 1mL of perchloric acid, cover it with a watch glass, shake it well, place it on a hot plate and heat it to 220-250°C for digestion until it evaporates. White smoke, adjust the temperature of the electric heating plate to 180-200 °C and keep the digestion solution in the reflux state in the beaker until 3-4 mL of liquid is left and the solution is colorless. After cooling, dilute to a 50mL volumetric flask, dilute to volume with water, and shake well.

[0045] (2) Measured by an inductively coupled plasma emission spectrometer, the wavelength is 214.914nm; the power is 1150W, the pump speed is 40rpm, the vertical observation height is 12mm, the cooling air flow rate is 1.0L / min, the atomizer pressure is 0.3MPa, and the integral The...

experiment example 1

[0056] This experimental example investigates the method for measuring the total phosphorus content in water provided by Example 1 and Comparative Examples 1 to 2, as follows:

[0057] (1) Prepare the water sample to be tested: weigh 0.439g of potassium dihydrogen phosphate, dissolve it in water, transfer it into a 1000mL volumetric flask and dilute to the mark to obtain a phosphorus standard stock with a concentration of 0.1mg / mL; then take 10mL of phosphorus standard stock solution In a 100mL volumetric flask, dilute to the mark to obtain the water sample to be tested; the total phosphorus content in the obtained water sample to be tested is 10 μg / mL.

[0058] (2) adopt the method of embodiment 1, comparative example 1~2 respectively to measure above-mentioned water sample to be tested, and measurement result is as shown in table 1;

[0059] Table 1

[0060]

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Abstract

The invention relates to the technical field of phosphorus content detection, in particular to a method for determining the total phosphorus content in water. The method comprises the following steps:digesting a to-be-detected water sample by adopting mixed acid, the mixed acid being sulfuric acid and perchloric acid which are mixed in equal proportion. The determination method is an inductivelycoupled plasma emission spectrometry. Experiments prove that a general water sample can be completely digested by adding a small amount of sulfuric acid and perchloric acid in equal proportion, the pHvalue does not need to be adjusted after digestion is completed, and color development is not needed in the determination process; when the inductively coupled plasma emission spectrometer is used for measurement, the method is not influenced by arsenic, sulfide, chromium and other elements, is not limited by color development time, is not influenced by room temperature, improves the test efficiency, increases the test precision, and is more suitable for testing large-batch samples in laboratories.

Description

technical field [0001] The invention relates to the technical field of phosphorus content detection, in particular to a method for measuring total phosphorus content in water. Background technique [0002] At present, the methods for determining total phosphorus in water include "GB 11893-1989 Determination of Total Phosphorus in Water Quality Ammonium Molybdate Spectrophotometry", "HJ 670-2013 Determination of Phosphate and Total Phosphorus in Water Quality Continuous Flow-Ammonium Molybdate Spectrophotometry" , "HJ 671-2013 Determination of Total Phosphorus in Water Quality Flow Injection-Ammonium Molybdate Spectrophotometry", "MT / T 743.1-2011 Determination Method of Total Phosphorus in Coal Mine Water" and other methods. [0003] The above methods all use ammonium molybdate spectrophotometry or phosphomolybdenum blue spectrophotometry, which require the preparation of chromogenic reagents and buffers, and have strict time requirements. If the reaction time of the standard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/44G01N33/18
CPCG01N21/73G01N1/44G01N33/18
Inventor 张晶刘金龙王艳超王洋李博何汉江张霞
Owner 中化地质矿山总局地质研究院
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