Solid suspension dispersing agent for testing sample, preparation method and testing method thereof

Abstract

The invention discloses a dispersing agent for solid suspension and a preparation method thereof in the testing technique of suspension solid sampling elements. The dispersing agent is mixed liquid formed by combining agar, ethanol and water proportionally. The preparation method for the dispersing agent comprises the following steps of: weighing a proper amount of the agar and placing the agar in a container; adding water to dissolve and clarify through ultrasonic oscillation at the room temperature or at the temperature of no higher than 40 DEG C; diluting and determining the volume by using the ethanol; and then oscillating for a plurality of minutes ultrasonically. The preparation method for the solid suspension comprises the following steps of: weighing titanium dioxide, vanadium pentoxide, iron oxide red or other samples to be tested and placing the titanium dioxide, the vanadium pentoxide, the iron oxide red or other samples into a container; adding the mixed dispersing agent of the agar and the ethanol; determining the volume by using water; and oscillating ultrasonically to obtain the solid suspension of the sample to be tested. The testing method comprises the following step of directly testing and analyzing the produced solid suspension by adopting instruments of graphite furnace atomic absorption spectrometry, flame atomic absorption spectrometry or inductively coupled plasma atomic emission spectrometry and the like so as to obtain the content of the elements in the sample.

Description

technical field [0001] The invention relates to a solid sample detection technology, in particular to a solid suspension dispersant for solid sample detection, a preparation method thereof, and a preparation and detection method of the solid suspension. Background technique [0002] In the detection and analysis of elements, high-temperature melting reaction or wet chemical digestion is generally used. Firstly, the sample is processed into a clear and transparent solution before measurement. Not only is the operation complicated, the inspection process is long, and the sample is often difficult to digest. , or during the digestion process, the elements to be measured are easily lost, contaminated, and blanks are increased. Therefore, the suspension solid sampling detection technology that saves the sample digestion step has been rapidly developed and popular, including the determination of refractory TiO 2 There are also literature reports on volatile elements such as Hg, P...

AI Technical Summary

Problems solved by technology

A large amount of organic reagents has a great impact on personnel and the environment, and there are many interferences in the measurement

[0005] Sodium hexametaphosphate or sodium silicate is relatively seldom used due to unfavorable factors such as the introduction of alkali metal sodium ions and high reagent background blank, which interfere with subsequent instrumental analysis and determination.

However, the agar aqueous dispersant has the following disadvantages: 1. the agar aqueous solution is perishable and rotten, becomes muddy and smelly, and the storage time is very short, especially in summer, which usually needs to be prepared immediately after use.

② If the amount of agar is small, the dispersion effect will be poor, and the suspension will be uneven and unstable; if the amount is too large, the suspension will have high viscosity and poor fluidity, which will affect the sample transfer efficiency of the instrument and seriously interfere with the determination of the matrix effect

Now you can only choose the dosage in a compromise, and seek a balance between the dispersion effect and the measurement interference

Images