Quantitative Determination of Volatile Acids by Paper Chromatography for Application to Sewage Sludge Digestion

1957 ◽  
Vol 29 (10) ◽  
pp. 1441-1443 ◽  
Author(s):  
R. M. Manganelli ◽  
F. R. Brofazi
Keyword(s):  
Sewage Sludge ◽  
Quantitative Determination ◽  
Paper Chromatography ◽  
Sludge Digestion

Quantitative determination of organic priority pollutants in sewage sludge by GC/MS

Chemosphere ◽  
1997 ◽  
Vol 34 (8) ◽  
pp. 1705-1712 ◽  
Author(s):  
R. Lega ◽  
G. Ladwig ◽  
O. Meresz ◽  
R.E. Clement ◽  
G. Crawford ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Quantitative Determination ◽  
Priority Pollutants

Quantitative Untersuchungen über die Ommochromvorstufen in den Malpighischen Gefäßen verschiedener Drosophila-Mutanten

1968 ◽  
Vol 23 (4) ◽  
pp. 547-554 ◽  
Author(s):  
Dieter Eichelberg
Keyword(s):  
Sex Differences ◽  
Drosophila Melanogaster ◽  
Quantitative Determination ◽  
Paper Chromatography ◽  
Type A ◽  
Individual Development ◽  
Wild Type ◽  
Strong Reduction ◽  
The Individual

This paper concerns with the quantitative determination of ommochrome precursors in the Malpighian tubes of Drosophila melanogaster during the individual development. After separation by paper chromatography the amounts of tryptophane, kynurenine and 3-hydroxykynurenine have been estimated by a spectrophotometer. The concentrations of these three substances obtained from wild-type Malpighian tubes have been compared with the quantities of the mutants brown (bw) and red Malpighian tubes (red). During development there are significant variabilities in contents of tryptophane, kynurenine and 3-hydroxykynurenine in the Malpighian tubes. In the larval tubes large quantities of ommochrome precursors are accumulated. With the beginning of metamorphosis there is a distinct decrease in these substances. After hatching the amount increases steadily until reaching a constant level. In the Malpighian tubes there are also sex differences: in females the concentration of kynurenine and 3-hydroxykynurenine is higher than in males. The results obtained from the mutants brown and red Malpighian tubes are on principle the same as those obtained from wild-type. A strong reduction of kynurenine contents is found in the mutant red Malpighian tubes. Perhaps in this mutant the kynurenine-hydroxilase-activity is lower than in wild-type. The amounts of ommochrome precursors, accumulated in the larval Malpighian tubes, do not correspond in all cases to the contents of xanthommatine formed in the eyes of the adults.

Quantitative Determination of Tris-(2,3,-dibromopropyl) Phosphate by Densitometry of Thin Layer Chromatograms

1979 ◽  
Vol 62 (6) ◽  
pp. 1315-1318
Author(s):  
Albert M Gardner
Keyword(s):  
Sewage Sludge ◽  
Thin Layer ◽  
Quantitative Determination ◽  
Ethyl Acetate ◽  
Silver Nitrate ◽  
Flame Retardant ◽  
Silica Gel ◽  
White Background ◽  
Ppm Level

Abstract The flame retardant tris-(2,3-dibromopropyl) phosphate (Tris) was chromatographed on silica gel thin layer plates, using ethyl acetate-hexane (30+70) as the developing solvent. Tris was visualized by spraying the chromatogram with 1% aqueous silver nitrate followed by exposure to ultraviolet light for 40 min. Tris appeared as dark gray spots on a white background; the spots were quantitated by densitometry at 600 nm. The lower level of sensitivity was 50 ng; calibration plots were linear from 50 to 800 ng. The procedure was developed to determine the levels of unmetabolized Tris remaining after exposure to sewage sludge suspensions. Recovery of Tris from 3 sewage sludge samples fortified at the 1.0 ppm level averaged 97%.

Quantitative determination of serum triglycerides by glass-fiber paper chromatography

1964 ◽  
Vol 8 (2) ◽  
pp. 158-163 ◽  
Author(s):  
Karoly G. Pinter ◽  
James G. Hamilton ◽  
O. Neal Miller
Keyword(s):  
Quantitative Determination ◽  
Glass Fiber ◽  
Paper Chromatography ◽  
Serum Triglycerides

A solvent for qualitative and quantitative determination of sugars using paper chromatography

1960 ◽  
Vol 3 ◽  
pp. 343-350 ◽  
Author(s):  
P. Colombo ◽  
D. Corbetta ◽  
A. Pirotta ◽  
G. Ruffini ◽  
A. Sartori
Keyword(s):  
Quantitative Determination ◽  
Paper Chromatography ◽  
Qualitative And Quantitative

The Quantitative Determination of Mixed Sulfonamides by Paper Chromatography

1963 ◽  
Vol 46 (5) ◽  
pp. 899-901
Author(s):  
Frieda M Kunze ◽  
Luis Espinoza B
Keyword(s):  
Quantitative Determination ◽  
Ultraviolet Light ◽  
Paper Chromatography ◽  
Short Wavelength ◽  
Mean Deviation ◽  
Marshall Technique ◽  
Quantitative Procedure

Abstract A simplified quantitative procedure for the determination of mixed sulfonamides in pharmaceuticals is presented. The components are resolved by paper chromatography and located by their fluorescence under short wavelength ultraviolet light. They are then eluted and determined colorimetrically by a revised Bratton-Marshall technique. Total time of analysis is less than 4 hours. Recoveries averaged 98.8% with a range of 95.7 to 103.4%. Mean deviation from the average was 1.4%.

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