A Neutral Wedge Abridged Spectrophotometer

Clifford, P A; Brice, B. A.

doi:10.1021/ac50144a015

Cited by 5 publications

(1 citation statement)

References 17 publications

(10 reference statements)

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“…In the 16 food inspection laboratories of the U. S. Food and Drug Administration a very moderately priced, home-made, neutral-wedge photometer with a special set of color filters has given most excellent service. The neutralwedge photometer (5) designed by Clifford and Brice is now made commercially. Moderately priced photoelectric photometers using color filters are on the way.…”

Section: Determinationsmentioning

confidence: 99%

Isolation and Detemination of Traces of Metals

Wichmann¹

1939

Ind. Eng. Chem. Anal. Ed.

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In most inorganic tests using organic materials the pH must be somewhat controlled. The molybdenum test using tincture of cochineal which is sensitive to 0.02 gamma of molybdenum oxide must be carried out at a pH between 5.7 and 6.2.It is hoped that fluorescence will add to the specific test for the elements. Such a case is illustrated in the Pontachrome Blue Black R (2S) test for aluminum, which is sensitive to 0.2 gamma of aluminum-ion concentration and to a dilution of one part in ten million. It serves to distinguish aluminum from all other elements investigated, and is the first direct chemical test to differentiate it from beryllium. The morin fluorescent test for aluminum is more sensitive and will detect 0.05 gamma at 1 part in 10,000,000 but is given also by beryllium, indium, gallium, and the rare earths.In addition to the examples given, fluorescent tests, all of microapplication, have been worked out for beryllium, zinc, arsenic, tin, bismuth, manganese, cadmium, columbium, HgBOs, and H2S03. A detailed description of these is given by Haitinger (14)• Gotó (11) lists fluorescent methods for about twenty-one elements. This indicates fair progress in the development of fluorescent determinations. Fluorescence is in

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Section: Determinationsmentioning

confidence: 99%