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Reagent requirements and basic representation of solution concentration.

2022-12-23

The water used in the test method shall refer to distilled water or deionized water if no other requirements are indicated. When the solvent of the solution is not specified, it refers to an aqueous solution. When the specific concentration of H2SO4, HNO3, HCL and NH3·H2O is not specified in the test method, all refer to the concentration of commercially available reagent specifications. The drop of liquid refers to the amount of a drop of distilled water flowing from a standard dropper, which is equivalent to 1.0mL at 20 ° C

Solution concentration can be expressed in the following ways:
① To the standard concentration (that is, the concentration of a substance) : it is defined as the amount of substance containing solute in a unit volume of solution, the unit is Mol/L

② In proportion to concentration: that is, in several solid reagent mixed mass or liquid reagent mixed volume number, can be written as (1+1) (4+2+1) and other forms

③ On the mass (volume) fraction: on the solute accounted for the mass fraction or volume fraction of solution expression, can be denoted as w or Phi.

(4) If the solution concentration is expressed in units of mass and capacity, it can be expressed as g/L or by its appropriate multiple (such as mg/mL).

Requirements and other requirements for preparation of solution:
The purity of reagents and solvents used in the preparation of the solution should meet the requirements of the analysis item. General reagents are stored in hard glass bottles, lye and metal solutions are stored in polyethylene bottles, and photoproof reagents are stored in brown bottles.

Parallel tests must be made in the inspection. The representation of inspection results should be consistent with the representation of food hygiene standards, and the calculation and value of data should follow the law of significant numbers and the rule of number choice.

The inspection process shall be conducted in strict accordance with the analytical steps specified in the standard, and protective measures shall be taken against unsafe factors (poisoning, explosion, corrosion, burn, etc.) in the experiment. Physical and chemical inspection laboratory implements analysis quality control. Based on the establishment of good technical specifications, the determination method should have detection limits, precision, accuracy, drawing standard curve data and other technical parameters. Inspectors should fill out inspection records.

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