ASTM E581 Standard Test Methods for Chemical Analysis of Manganese-Copper Alloys

ASTM E581 is a set of standard test methods that covers the procedure for chemical analysis of manganese-copper alloys having specific chemical compositions. The alloys are tested in different solutions and using different methods. The final results of this test method are expressed in SI units. 

ASTM E581 test method covers the testing of iron by the 1,10-Phenanthroline Photometric method, Manganese by the Tetraacetic Acid method, and Phosphorous by the Molybdivanadophosphoric Acid Extraction Photometric Method. These test methods for the chemical analysis of metals and alloys are primarily intended to test such materials for compliance with compositional specifications. The stiffness of the material, recovery of the deformed portion, strain calculation, functioning, product assessment, transformation temperatures, quality control, specification acceptance, and research are dealt with in this method. This makes it easier for the customer and supplier to reach an agreement. Moreover, it enables safety and performance evaluation.

For the preparation of solutions in this test method, 5.0 g of hydroxylamine hydrochloride solution, 0.125g of Iron for Solution A, 50 mL of Iron for solution B, 200mL of Methyl isobutyl ketone, and 1.0 g of 1,10-phenanthroline monohydrate solution are taken. For the determination of Iron by the photometric method, the sample is mixed with HCl and OH. A methyl isobutyl ketone-benzene mixture is used to extract iron, and measurements are taken at 510 nm. For manganese determination, the sample is mixed with nitric acid, and the pH is adjusted to 10. Back titration with a standard manganese solution determines manganese. To determine phosphorus, the sample is mixed with nitric acid and HCl. The measurements are taken at 400 nm. 

Iron, manganese, and phosphorus are determined using different formulas under specific conditions of temperature, pH, and concentration. 

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