Single standard substance for the determination of nine volatile components in the distillate of Fructus Gardeniae and Radix Curcumae (an intermediate of Xingnaojing Injection)

2017 ◽  
Vol 40 (20) ◽  
pp. 3946-3957 ◽  
Author(s):  
Jinyang Fang ◽  
Bo Yang ◽  
Zhiwei Ge ◽  
Xue Bai ◽  
Binjun Yan
Keyword(s):  
Volatile Components ◽  
Standard Substance ◽  
Xingnaojing Injection ◽  
Single Standard

Photometric Determination of pH with a Single Standard and Calculation by Nomogram

1966 ◽  
Vol 12 (12) ◽  
pp. 849-870 ◽  
Author(s):  
Donald D Van Slyke ◽  
Lawrence V Hankes ◽  
Janis John Vitols
Keyword(s):  
Human Plasma ◽  
Photometric Determination ◽  
Glass Electrode ◽  
Phenol Red ◽  
Ph Values ◽  
Slow Fading ◽  
Standard Solution ◽  
Single Standard ◽  
Hasselbalch Equation

Abstract A method is described for construction of a nomogram, based on the Henderson Hasselbalch equation, with which photometric pH values can be calculated from the absorbance of an indicator in a sample and the absorbance of the indicator in a single standard solution. Thereby the necessity of preparing calibration curves from a series of standard solutions is avoided. The procedure is particularly convenient when the stock solution of the indicator is subject to slow fading, as in the case of phenol red. An application of the procedure to the photometric determination of the pH of human plasma is detailed and the results are compared with those obtained with a glass electrode.

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