Значение и использование

The accuracy of many analytical measurements is dependent upon the manner in which the standard solutions are prepared and stored, and the accuracy with which they are standardized. Combining the methods recommended for the preparation and handling of such solutions into one practice eliminates the necessity for covering such details in all of the methods wherein the solutions are used.

Область применения

1.1 This practice covers procedures for the preparation, standardization, and storage of the standard volumetric solutions and reagent testing solutions commonly used in chemical analysis.

1.2 The information in this practice is arranged as follows:

Sections Referenced Documents 2 Terminology 3 Significance and Use 4 Apparatus 5 Temperature effects 6 Measurements 7 Reagents 8 Concentration of solutions 9 Mixing of solutions10 Storage of solutions11 Preparation and standardization of solutions12 Precision and Bias13 Sodium hydroxide solution, 0.02 to 1.0 meq/mL (N) 14 to 19 Hydrochloric acid, 0.02 to 1.0 meq/mL (N)20 to 28 Sulfuric acid, 0.02 to 1.0 meq/mL (N)29 to 33 Hydrochloric acid, special 1 meq/mL (N)34 to 38 Sulfuric acid, special 1meq/mL (N)39 to 43 Silver nitrate solution, 0.1 meq/mL (N)44 to 48 Ammonium thiocyanate solution, 0.1 meq/mL (N)49 to 53 Iodine solution, 0.1 meq/mL (N)54 to 58 Sodium thiosulfate solution, 0.1 meq/mL (N)59 to 63 Potassium permanganate solution, 0.1 meq/mL (N) 64 to 68 Potassium dichromate solution, 0.1 meq/mL(N)69 to 73 Methanolic sodium hydroxide solution, 0.5 meq/mL (N) 74 to 79 Ceric sulfate solution, 0.1 meq/mL (N)80 to 84 Acetous perchloric acid, 0.1 meq/mL (N)85 to 89 Disodium ethylenediaminetetraacetate solution, 0.05 mol/L(M)90 to 94 Standard ion solutions95 Nonstandardized reagent solutions and indicator solutions96

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given throughout this practice.