Colorimetric Determination of Chloride in Biological Samples by Using Mercuric Nitrate and Diphenylcarbazone

2002 ◽  
Vol 85 (1) ◽  
pp. 87-94 ◽  
Author(s):  
Katsuhiko Yokoi
Keyword(s):  
Biological Samples ◽  
Colorimetric Determination ◽  
Mercuric Nitrate

Colorimetric Determination of Aconitine in Galenicals and in Biological Samples

1976 ◽  
Vol 59 (4) ◽  
pp. 799-801
Author(s):  
Mohamed S Karawya ◽  
Abdel-Aziz A Sharaf ◽  
Aly M Diab
Keyword(s):  
Quantitative Determination ◽  
Biological Samples ◽  
Cobalt Complex ◽  
Colorimetric Determination ◽  
Animal Tissues ◽  
Sensitive Method

Abstract A sensitive method is presented for determining aconitine. Aconitine is complexed with Co2+, the aconitine-cobalt complex is extracted with chloroform, and the absorbance is measured at 320 nm. The sensitivity of the method ranged between 0.06 and 3 mg/25 ml, and the color was stable for 6 hr. The method was successfully applied for the quantitative determination of aconitine in animal tissues.

Blister-colorimetric determination of phosphate ions in water, agricultural samples, and biological samples

2007 ◽  
Vol 62 (1) ◽  
pp. 37-41 ◽  
Author(s):  
D. A. Knyazev ◽  
A. V. Zhevnerov ◽  
V. M. Ivanov ◽  
V. D. Knyazev
Keyword(s):  
Biological Samples ◽  
Colorimetric Determination ◽  
Phosphate Ions

Rapid Colorimetric Determination of Microgram Amounts of Selenium in Soils and Biological Samples, Using Millipore Filters

1965 ◽  
Vol 48 (2) ◽  
pp. 322-326
Author(s):  
Carvel L Newberry ◽  
Gary D Christian
Keyword(s):  
Biological Samples ◽  
Soil Samples ◽  
Complete Analysis ◽  
Colorimetric Determination ◽  
Selenium Content ◽  
Acid Digestion ◽  
Millipore Filter ◽  
Control Of Variables ◽  
Millipore Filters

Abstract A method is described for the determination of selenium in biological samples or soil samples, following acid digestion or distillation as the tetrabromide, respectively. The selenium is reduced to the element by ascorbic acid. The element is filtered and collected on a white Millipore filter. The intensity of the coloration of the filter is used as a measure of the selenium content. The range of the method is from 0.2 μg selenium to > 0.1 mg selenium. Complete analysis time for a single biological sample is about 60 minutes, while that for a soil sample is less than 2 hours. Control of variables is not critical.

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