ANSI PH4.44 : 1987
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
PHOTOGRAPHIC PROCESSING WASTE - DETERMINATION OF HYDROQUINONE CONTENT - SPECTROPHOTOMETRIC METHOD
03-15-2022
01-12-2013
1. Scope and Field of Application
2. References
3. Principle
4. Reactions
5. Reagents
5.1 Sodium Hydroxide, 1 mol/L Solution
5.2 Sodium Hydroxide, 0.25 mol/L Solution
5.3 Citric Acid, Buffer Solution
5.4 Water/Methanol Mixture
5.5 1-Ethylquinaldinium Iodide, 2 g/L Solution
5.6 1-Pentanol
5.7 Hydrochloric Acid, Diluted 1 + 4
5.8 Hydrochloric Acid, 0.01 mol/L Solution
5.9 Hydroquinone, Stock Solution
5.10 Hydroquinone, Standard Solution
5.11 Methanol
5.12 pH Indicator Paper
6. Apparatus
6.1 Separatory Funnels
6.2 One-Mark Volumetric Flasks
6.3 Pipettes
6.4 Micro Pipette
6.5 Spectrophotometer
8. Procedure
8.1 Extraction
8.2 Colour Development and Spectrophotometric Measurements
8.3 Preparation of the Calibration Graph
9. Expression of Results
10. Test Report
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