Spectrophotometric determination of pyrocatechol, resorcinol and phloroglucinol with potassium iodate in dilute nitric acid

Abstract A spectrophotometric method has been developed for the microdetermination of carbofuran in water. The method is based on the reaction of carbofuran phenol (2,3-dihydro-2,2-dimethyI-7-hydroxy benzofuran) with nitric acid to form a colored compound with an absorption maximum at 345 nm. The method is applicable to residues in the range 10-150 μg/5 mL solution.

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Determination of aluminum in moisturizing body lotions using graphite furnace atomic absorption spectrometry

Analytical Methods ◽

10.1039/c5ay02123e ◽

2015 ◽

Vol 7 (22) ◽

pp. 9636-9640 ◽

Cited By ~ 7

Author(s):

Ivan N. B. Castilho ◽

Daiane P. C. de Quadros ◽

Renata Mior ◽

Bernhard Welz ◽

Eduardo Carasek ◽

...

Keyword(s):

Nitric Acid ◽

Atomic Absorption Spectrometry ◽

Atomic Absorption ◽

Graphite Furnace ◽

Absorption Spectrometry ◽

Graphite Furnace Atomic Absorption ◽

Graphite Furnace Aas ◽

Dilute Nitric Acid

Aluminum has been determined in body lotions after mixing with dilute nitric acid using graphite furnace AAS and Zr as a permanent modifier.

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Spectrophotometric determination of novalgin in tablets by use of potassium iodate

Talanta ◽

10.1016/0039-9140(89)80171-7 ◽

1989 ◽

Vol 36 (8) ◽

pp. 869-871 ◽

Cited By ~ 12

Author(s):

Saidul Zafar Qureshi ◽

Ahsan Saeed ◽

Tausiful Hasan

Keyword(s):

Spectrophotometric Determination ◽

Potassium Iodate

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Mercurimetric Determination of Chloride in Biologic Fluids Using 2-(8-Hydroxyquinolyl-5-azo)-Benzoic Acid (QBA*)

Clinical Chemistry ◽

10.1093/clinchem/14.12.1172 ◽

1968 ◽

Vol 14 (12) ◽

pp. 1172-1175

Author(s):

E Melvin Gindler

Keyword(s):

Nitric Acid ◽

Benzoic Acid ◽

Chloride Ion ◽

Color Changes ◽

Dilute Nitric Acid

Abstract 2-(8-Hydroxyquinolyl-5-azo)-benzoic acid (QBA) may be substituted for s-diphenylcarbazone as an indicator in the direct mercurimetric titration of chloride ion in biologic fluids. Both indicators give color changes at the same point in the titration. In dilute nitric acid, the Hg(II)-QBA complex is rose-red, whereas unmetallized QBA is orange.

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Spectrophotometric Determination of Microgram Quantities of Copper in Biologic Materials

Clinical Chemistry ◽

10.1093/clinchem/10.9.845 ◽

1964 ◽

Vol 10 (9) ◽

pp. 845-852 ◽

Cited By ~ 4

Author(s):

Ramon E Stoner ◽

Waldemar Dasler

Keyword(s):

Nitric Acid ◽

Spectrophotometric Determination ◽

Alkaline Solution ◽

Perchloric Acid ◽

Acid Mixture

Abstract A procedure for the determination of microgram quantities of copper in biologic material is described. The sample is wet-ashed with a nitric acid-perchloric acid mixture. The copper is extracted from an alkaline solution of the ash with a solution of diphenylcarbazide in benzene. Absorbance of the red complex is read at 540 mµ. The copper in as little as 0.5 ml. of serum can be determined and the method is suitable for routine determinations. The use of microcells makes possible the analysis of 0.1 ml. of serum.

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Determination of Free Carbon in Cured Rubber Stocks

Rubber Chemistry and Technology ◽

10.5254/1.3543042 ◽

1951 ◽

Vol 24 (1) ◽

pp. 224-227

Author(s):

I. M. Kolthoff ◽

R. G. Gutmacher

Keyword(s):

Nitric Acid ◽

Carbon Black ◽

Natural Rubber ◽

Osmium Tetroxide ◽

Free Carbon ◽

Vulcanized Rubber ◽

Tert Butyl Hydroperoxide ◽

Inorganic Fillers ◽

Dilute Nitric Acid

Abstract A method for the determination of free carbon in vulcanized rubber stocks is described. The sample is softened in boiling p-dichlorobenzene before treatment with tert-butyl hydroperoxide in the presence of osmium tetroxide. No difficulties are encountered in the filtration of the carbon black. The carbon black is washed on the filter with dilute nitric acid to remove acid-soluble inorganic fillers. The method has been successfully applied to natural rubber, GR-S, Butyl rubber, and Neoprene. No correction is necessary.

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