Method for measuring total phosphorus in sludge

Abstract

The invention discloses a method for measuring total phosphorus in sludge. The method comprises the following steps that a sludge sample is weighted in a polytetrafluoroethylene bottle, aqua regia is added to the bottle, each milliliter of the aqua regia contains 0.03-0.05 g of sludge in average, and after even shake, stewing is conducted for 7-12 hours to obtain a sample solution; the sample solution after stewing is placed in a graphite furnace to conduct decomposition reaction, and after the reaction is completed, heating continues until the residual volume is 4-6%; the residual solution is taken, hydrofluoric acid is added to the solution, the volume of the hydrofluoric acid occupies 1 / 2 to 3 / 5 of that of the aqua regia, and a cover is removed to conduct heat evaporation; the processed sample is taken, perchloric acid is added to the sample, the volume of the perchloric acid occupied 1 / 10 to 3 / 20 of that of the aqua regia, heating continues, and then the solution is cooled to the room temperature; after the sample is cooled to the room temperature, water is added to the sample to conduct constant volume, and supernatant liquor is obtained; the supernatant liquor is taken to measure the content of the total phosphorus. Compared with the prior art, the method for measuring the total phosphorus in the sludge has the advantages that the method is fast and easy to operate, the measurement result is accurate and credible, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for measuring total phosphorus in sludge. Background technique [0002] With the acceleration of my country's urbanization process, the discharge of domestic sewage and industrial wastewater in cities is increasing, and the output of sludge is also increasing rapidly. These sludges contain a variety of bacterial micelles formed by microorganisms and their adsorbed organic matter, heavy metal elements and salts. Reasonable treatment must be carried out before discharge, otherwise it will cause great harm to water bodies, soil and even the entire ecology. Phosphorus and phosphate are not only essential nutrients to maintain life activities, but also important chemical and chemical raw materials, widely used in synthetic detergents, fertilizers, refining and other fields. However, due to the one-way flow of phosphorus, most of the phosphorus can only be stored in organis...

AI Technical Summary

Problems solved by technology

Although the measurement results using this method are accurate, the measurement process is too cumbersome. For example, the whole process of temperature rise needs to be monitored, and the pH value of the solution should be adjusted slowly with dilute acid. Otherwise, the solution will be overheated and ejected from the volumetric flask, which is very unfavorable. Industrial application

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