ASTM D126-2019 pdf free download

ASTM D126-2019 pdf free download.Standard Test Methods for Analysis of Yellow, Orange, and Green Pigments Containing Lead Chromate and Chromium Oxide Green
1. Scope
1.1 These test methods cover procedures for the chemical analysis of yellow, orange, and green pigments containing lead chromate and chromium oxide green. 1.2 The analytical procedures appear in the following order:1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Note 3. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Summary of Test Methods
3.1 Chrome Yellow, Chrome Orange, and Molybdate Or- ange: 3.1.1 Organic colors and lakes are determined qualitatively by boiling the sample in water, then ethyl alcohol, and finally chloroform. 3.1.2 Moisture and other volatile matter are determined in accordance with Test Method A of Test Methods D280. 3.1.3 Matter soluble in water is determined by boiling in water and filtering.3.1.4 Lead chromate is determined by dissolving the sample in dilute HCl, filtering and titrating potentiometrically with FeSO 4 solution after addition of HClO 4 . 3.1.5 Total lead is determined by precipitation as lead sulfide solution with H 2 SO 4 and final precipitation as lead sulfate. 3.1.6 Sulfate is determined by dissolving the sample in acetic acid, neutralizing with sodium carbonate, plus addition of HCl to an aliquot followed by addition of BaCl 2 to precipitate as barium sulfate. 3.1.7 Carbon dioxide is determined by evolution. 3.1.8 Molybdenum is determined by precipitation as the sulfide, solution in HNO 3 and H 2 SO 4 , addition of NH 4 OH and H 2 SO 4 . The solution is reduced in a Jones reductor, collected under Fe 2 (SO 4 ) 3 solution and titrated with KMnO 4 solution. 3.1.9 Extenders are either: 3.1.9.1 Calcium carbonate, calcium sulfate, magnesium car- bonate or; (a) The compounds in 3.1.9.1 are determined qualitatively by precipitation with ammonium solution. (b) If chromium is present, it is reduced and the lead salts dissolved in dissolving solution. Hydroxides and hydrous oxides are precipitated by addition of HCl and NH 4 OH and filtered. CaC 2 O 4 is precipitated with calcium oxalate solution and filtered, ashed and weighed as CaO. Alternatively, the precipitate is dissolved in H 2 SO 4 and titrated with KMnO 4 . Magnesium is determined on the filtrate from calcium deter- mination by precipitation as the phosphate with ammonium phosphate solution. 3.2 Chromium Oxide Green: 3.2.1 Organic colors and lakes are determined qualitatively by boiling the sample in water, then ethyl alcohol, and finally choloroform. 3.2.2 Moisture and other volatile matter are determined in accordance with Test Method A of Test Methods D280. 3.2.3 Matter soluble in water is determined by boiling in water and filtering. 3.2.4 Total chromium as chromium oxide is determined by dissolving the sample in dilute HCl, filtering and titrating potentiometrically with FeSO 4 solution after addition of HClO 4 .
4. Significance and Use
4.1 These test methods are for analysis designed as an aid in quality of yellow, orange, and green pigments containing lead chromate and chromium oxide green. Some sections may be applicable to analysis of these pigments when extracted from whole paints.
5. Purity of Reagents and Water
5.1 Reagents—Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. 4 Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination. 5.2 Water—Unless otherwise indicated, references to water for use in the preparation of reagents and in analytical procedures shall be understood to mean reagent water con- forming to Type II of Specification D1193.