A simple, sensitive and specific method for the determination of ozone in the atmosphere is described. Reactions of ozone with several 1-alkenes were studied at room temperature (25°). Eugenol(4-allyl-2-methoxyphenol), when reacted with ozone, was found to produce relatively large amounts of formaldehyde compared to other 1-alkenes tested. The method described was compared with alkaline iodide method for the determination of various concentrations of ozone in the range 0.05–2.0 p.p.m. Hydrogen peroxide, peracetic acid, sulfur dioxide and various reducing agents commonly present in the air, do not interfere. Formaldehyde when present in the air, must be determined simultaneously and the concentration of formaldehyde subtracted from that of the ozone. Any formaldehyde monitoring equipment can be easily adapted for the determination of ozone.

The selenium content of various types of papers including cigarette papers has been determined. The selenium content of representative tobaccos from different parts of the world has also been determined. Samples were processed by decomposing them by means of the oxygen flask combustion technique. After excess oxygen was eliminated the selenium content was determined by means of the catalytic method of West and Ramakrishna (16). The selenium content of cigarette papers was found to range from 0.87 to 2.11 ppm (as SeO2) while filter papers and newspapers were found to contain from 0.21 to 1.38 ppm. The selenium content of most tobaccos fell somewhere in the range of 0.46 to 1.20 ppm. The Indian crude cigarette (Beedi) was found to contain as high as 4.10 ppm. Discussion of the findings includes some observations on possible health significance of selenium in smoke. Comments are included regarding the hazards of cigarette smoking as compared to those of cigar and pipe smoking.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConcentration of trace metals by solvent extraction and their determination by atomic absorption spectrophotometryDavid H. Klein and Edward D. GoldbergCite this: Environ. Sci. Technol. 1970, 4, 9, 749–751Publication Date (Print):September 1, 1970Publication History Published online1 May 2002Published inissue 1 September 1970https://pubs.acs.org/doi/10.1021/es60044a005https://doi.org/10.1021/es60044a005research-articleACS PublicationsRequest reuse permissionsArticle Views142Altmetric-Citations66LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

A procedure for the preconcentration and determination of Ag+, Cd2+, Co2+, Cu2+, Ni2+, Pb2+ and Zn2+ is presented. The conditions for the simultaneous extraction of all these metal ions with dithizone in ethyl propionate are described. The metal dithizonates are very stable in ethyl propionate and the chelate-solvent system enhances the sensitivity for the atomic absorption method used for the determination. With 10:1 aqueous-organic solvent ratios, the sensitivities for 1% absorption of the signal range from 0.001 μg/ml for Cd2+ and Zn2+, to 0.004 μg/ml for Pb2+. Interference effects of 38 diverse ions and compounds were studied and their tolerance levels are given. The resulting procedure is very sensitive and selective.

A rapid and highly selective method for the microdetermination of orthophosphate using orthodianisidine molybdate reagent and the ring oven technique is presented. As little as 0.1 μg of orthophosphate can be determined with reasonable accuracy. Very little interference is involved. Only Zr4+, A13+ and Th4+ have been found to interfere when present in 100-fold excess. The method is of special interest for air pollution studies.

The effect of various organic solvents on the absorption characteristics of vanadium was studied in fuel-rich oxy-acetylene and nitrous oxide-acetylene flames. The absorption of the 3183.9 Å line of vanadium was greatly enhanced by the use of various mixed organic solvents when fed to oxy-acetylene flames. In the case of the nitrous oxide-acetylene flame, the addition of diethylene glycol (about 8% in the final solution) and similar compounds to the aqueous solution of vanadium increased the absorption by about 50%. The observations and the possible role of the mixed organic solvents are discussed.

Flames of 4 different kinds and of various compositions were studied for their suitability for atomic absorption spectroscopy for the determination of manganese, iron, cobalt and nickel. The effects of various other factors such as lamp current, slit-width and position of the burner were also investigated. Interference effects of a large number of ions and compounds were studied. Very few ions were found to interfere and means of eliminating the interferences noted are described. As a result of the investigation, sensitive and selective procedures for the determination of manganese, iron, cobalt and nickel are reported. Sensitivities are Mn, 0.01 mg/l; Fe, 0.05 mg/l; Co, 0.03 mg/l and Ni, 0.02 mg/l for 1% absorption.

Methods for the determination of vanadium, in the range 0.5–100 mg/l, by atomic absorption spectroscopy in an oxy-acetylene as well as in a nitrous oxideacetylene flame are presented. For use with oxy-acetylene flames, vanadium is extracted as vanadium cupferrate into a mixture of methyl isobutyl ketone and oleic acid (78:22, v/v) and the organic phase is aspirated to the flame. The sensitivity is 0.7 mg/l of vanadium in the organic phase. For nitrous oxide-acetylene flames, an aqueous solution of vanadium is aspirated directly. The sensitivity is further improved by the use of methyl isobutyl ketone, the addition of Al3+ and diethylene glycol diethyl ether. Many potential interferences were examined and methods to overcome those found are given.