Method for simultaneously determining contents of phosphorus, magnesium, iron and aluminum in phosphate ores by using ICP (inductively coupled plasma) method

Abstract

The invention relates to a method for simultaneously determining contents of phosphorus, magnesium, iron and aluminum in phosphate ores by using an ICP (inductively coupled plasma) method, which comprises the following steps: preparing a phosphorus, magnesium, iron and aluminum standard solution; preparing a sample solution; and using an inductively coupled plasma emission spectrometer for determination, wherein the phosphorus, magnesium, iron and aluminum standard solution is prepared by dissolving a phosphate ore sample in accordance with the standard GB / T 1871-1995 method and then determining the result. The standard solution and the sample solution to be determined are the same in basic element composition, total salinity, acid concentration, solution viscosity, surface tension and other aspects, and the physical interference and spectrum interference can be efficiently reduced, thereby increasing the accuracy of the determination result.

Description

technical field [0001] The invention relates to a method for determining the content of phosphorus, magnesium, iron and aluminum in phosphate rock, in particular to a method for simultaneously measuring phosphorus, magnesium, iron and aluminum in phosphate rock with an inductively coupled plasma emission spectrometer . Background technique [0002] Usually, the content of phosphorus, magnesium, iron and aluminum in phosphate rock is usually measured simultaneously by inductively coupled plasma emission spectrometer. This method is referred to as ICP spectrometry. 2. Prepare phosphorus, magnesium, iron and aluminum standard solutions; 3. Establish analysis methods for phosphorus, magnesium, iron and aluminum, and use ICP instruments for determination. The above standard solution of phosphorus, magnesium, iron and aluminum is prepared by mixing single element standard solutions of phosphorus, magnesium, iron and aluminum according to the required concentration. [0003] This...

AI Technical Summary

Problems solved by technology

[0003] This single-element standard solution of phosphorus, magnesium, iron, and aluminum is purchased from the market. It is difficult to keep the standard solution completely consistent with the sample solution in terms of matrix element composition, total salinity, etc., resulting in the difference between the two. Viscosity, specific gravity and surface tension are different

Since the viscosity, specific gravity, and surface tension of the solution affect the atomization process, droplet size, aerosol transmission, and solvent evaporation during ICP measurement, if the standard solution and the sample solution to be tested are in the matrix element There are large differences in the composition, total salinity, acidity, etc., which will cause obvious changes in the intensity of the spectral line during the measurement, resulting in physical interference, which will eventually affect the measurement results of the sample, resulting in large measurement errors

[0004] In addition, there is also spectral interference in the analysis of ICP spectroscopy. When two solutions of different compositions are atomized and pass through the ICP light source, they will emit quite rich spectral lines, resulting in different spectral line overlapping interference or background interference. Will affect the accuracy of sample determination results