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(1) Choice of instrument
The performance and measurement sensitivity of the instrument can directly affect the quality of the test results
(2) Choice of chemical reagents
The quality of reagents directly affects the quality of testing.
Commonly used chemical reagents for physical and chemical testing include general reagents, reference reagents, high-purity reagents and special reagents
In China's national standards, general reagents are divided into 3 grades, as shown in Table 1-1
The purity of the reference reagent is equal to or higher than that of the superior grade, which can be used to directly prepare or calibrate the standard solution
Table 1-1 Specifications and signs of chemical reagents
High purity reagents are reagents whose purity is much higher than that of superior grade
Special reagents refer to reagents with special purposes
The prices of different grades or categories of reagents vary greatly, so you should pay attention to saving when choosing them
(3) Selection of experimental water
Water is the most commonly used solvent
Table 1-2 Analytical laboratory water specifications (GB/T6682-2008)
The first grade water is used for micro and ultra micro analysis tests with strict requirements, such as water for high performance liquid chromatography
Tertiary water can be prepared by distillation or ion exchange methods