Monograph pubs.acs.org/doi/book/10.1021/acsreagents
1,10-Phenanthroline Monohydrate Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for 1,10-Phenanthroline Monohydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Suitability as Redox Indicator, and Suitability for Determining Iron.
C12H8N2 • H2O
Formula Wt 198.22
CAS No. 5144-89-8
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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white solid; may become cream-colored with storage colorimetric indicator; determination of iron; base for redox indicator melting point, 90–93 °C 0.3 g in 100 mL
SPECIFICATIONS Suitability as redox indicator . . . . . . . . . . . . . Passes test Suitability for determining iron . . . . . . . . . . . Passes test
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4262 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS †
For the Determination of Suitability as Redox Indicator and Suitability for Determining Iron
S a m p l e S o l u t i o n A . Sample Solution A. Dissolve 0.10 g in water, and dilute with water to 100 mL.
Suitability as Redox Indicator† To 2.5 mL of sample solution A, add 0.1 mL of 0.1 N ferrous ammonium sulfate solution and dilute to 50 mL with 12 N sulfuric acid. A distinct red color should be produced. Add 0.1 mL of 0.1 N potassium dichromate solution. The red color should be discharged.
Suitability for Determining Iron† To 20 mL of water, add 0.001 mg of iron and 1 mL of hydroxylamine hydrochloride reagent solution. For the control, add 1 mL of hydroxylamine hydrochloride reagent solution to 20 mL of water. To each solution, add 2.5 mL of sample solution A, and allow to stand for 1 h. The color in the solution containing the added iron should be definitely pink compared with the control. The control containing no added iron should not show any turbidity or color.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4262 ACS Reagent Chemicals, Part 4
