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Protective clothing for pesticide operators: part I – selection of a reference test chemical for penetration testing

Shaw A., Schiffelbein P.

International Journal of Occupational Safety and Ergonomics

2016

Vol. 22, No. 1

1--6

A systematic approach was taken to develop a database for protective clothing for pesticide operators; results are reported as a two-part series. Part I describes the research studies that led to identification of a pesticide formulation that could serve as a reference test chemical for further testing. Measurement of pesticide penetration was conducted using different types of pesticide formulations. Six fabrics were tested using 10 formulations at different concentrations. Three formulations were subsequently selected for further testing. Analysis of the data indicated that, when compared with other formulations, mean percent penetration of 5% Prowl 3.3 EC [emulsifiable concentrate diluted to 5% active ingredient (pendimethalin)] is either similar to or higher than most test chemicals. Those results led to choosing 5% Prowl 3.3 EC as a reference test liquid. Part II of the study, published as a separate paper, includes data on a wide range of textile materials.

New cethyltrimethylammonium methods for the determination of perchlorates

Cygański A., Kowalczyk P., Krystek J., Ptaszyński B.

Chemia Analityczna

2000

Vol. 45, No. 6

911-919

In the presence of cetyltrimethylammonium bromide (CTA) perchlorates form a sparingly soluble compound. The analysis has proved that it is cetyltrimethylammonium per-chlorate. In the present work gravimetric, nephelometric and turbidimetric methods of determination of perchlorates have been worked out. Measurements can be made in the pH range from 1.5 to 11.5. For 5 to 20 mg of perchlorate the gravimetric method and for 0.05 to 1.00 mg of perchlorate the nephelometric and turbidimetric methods can be used. The effect of foreign ions has been examined. Only large anions (e.g. MnO-(4), CrO4", Cr2O(2-), I-) interfere with the determination.

Chlorany(VII) w obecności bromku cetylotrimetyloamoniowego (CTA) tworzą trudno rozpuszczalny osad. Analiza wykazała, że jest to chloran(VII) cetylotrimetyloamo-niowy. Opracowano wagową, nefelometryczną i turbidymetryczną metodę oznaczania chloranów(VII). Oznaczenia można wykonywać w zakresie pH od 1,5 do 11,5 dla chloranów(VII) w ilości 5-20 mg (metoda wagowa) lub 0,05-1,00 mg (metoda nefelometryczną i turbidymetryczną). Zbadano wpływ jonów obcych. W oznaczeniu przeszkadzają tylko duże aniony (np. MnO4, CrO(2)(4), Cr7(2), I(-).