摘要:

An ion-exchange method for the measurement of levels of chelating agents in media with high levels of metal ions has been developed. The test solution is passed through a specially prepared ion-exchange column, which both removes metal ion interferences, and places the chelating agent in the copper form. The copper levels in the column effluent are then measured by flame atomic absorption methods, the copper levels corresponding in a 1:1 ratio to the levels of chelating agent in the sample. The detection limit for this method is on the order of 1 ppm copper equivalent chelating capacity, and is applicable in situations where the interfering metal ions are at concentrations in the range of 10−2M.The method is reproducible in the pH ranges of 4 to 9 Precision and

ISSN:0003-2719    

DOI:10.1080/00032717508058227

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A valve arrangement is described which can be incorporated into an apparatus previously designed for the simultaneous operation of large numbers of celite micro columns during the chromatographic separation of steroids. Compared to previous designs this modification reduces the total elution time of solvents from the column, renders the whole procedure less laborious and has the additional advantage of enabling the introduction of solvents into the chromatography column without disturbing the connection to the pressure supply.

ISSN:0003-2719    

DOI:10.1080/00032717508058228

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Primary and secondary amines react reproducibly with fluorescamine to form pyrrolinones or aminoenone type chromophores with long wavelength absorption maxima in the 375–410 and 310–320 nm regions, respectively. A simple procedure has been worked out for the simultaneous colorimetric determination of primary and secondary amines.

ISSN:0003-2719    

DOI:10.1080/00032717508058229

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Two atomic absorption accessory units were studied for the determination of arsenic and selenium in waters. One involves a flame mode while the other a flameless mode. Each was analyzed for requirements in speed per analyses, sample sizes required, potential interferences, coefficients of variation, and in overall ease in use.

ISSN:0003-2719    

DOI:10.1080/00032717508058230

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A computer method for the classification of mass spectra from routine gc-ms operation is described. The system is designed to incorporate the expertise of chemists but does not require the chemist to possess any knowledge of computer science. The method is illustrated by the analysis of a sedimentary sterol mixture and of an extract from saponified sewage sludge.

ISSN:0003-2719    

DOI:10.1080/00032717508058231

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A rapid, sensitive, and specific fluorescent test for picloram has been developed. Concentrated sulfuric acid 36N is added to the dry residue of picloram in glass test tubes, quartz tubes, or on a white porcelain plate. Yellow fluorescence is observed under long wavelength uv radiation when the test is performed in glass test tubes but with greater sensitivity under short wavelength uv radiation when done on a white porcelain plate or in quartz tubes.

ISSN:0003-2719    

DOI:10.1080/00032717508058232

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Arsenic electrodeless discharge lamps have been made with arsine gas as the source of arsenic. Lamps using arsine have been shown to be reproducible, intense, stable and long lived.

ISSN:0003-2719    

DOI:10.1080/00032717508058233

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A rapid accurate method was used to determine nitrate-nitrogen in Alaskan soil and plant material. Results obtained were in close agreement with those obtained by brucine and xylenol methods.

ISSN:0003-2719    

DOI:10.1080/00032717508058234

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0003-2719    

DOI:10.1080/00032717508058226

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor