An Improved Slow-Combustion Pipet for Gas Analysis

Porter, D. J.; Cryder, D. S.

doi:10.1021/ac50095a025

Ind. Eng. Chem. Anal. Ed.

1935

DOI: 10.1021/ac50095a025

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An Improved Slow-Combustion Pipet for Gas Analysis

D. J. Porter¹,

D. S. Cryder²

Abstract: Faint pink Orange red No change Orange yellow Red 2,4,6-Trintrobenzoic acid Red Pink Red Red Pink Pink 2,4,6-Trinitrobenzaldehyde Brownish red Faint brownish red Brownish red Brownish red Brownish red Brownish red 2,4,6-Trinitrophenylhydrazine Brownish red

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1999

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Cited by 3 publications

References 6 publications

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A Simplified Combustion Pipet

Nelson¹,

Weihe²,

Lynch³

1939

Ind. Eng. Chem. Anal. Ed.

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improvements in the design of combustion pipets have been made since 1876 when Coquillon (#) proposed the use of an electrically heated platinum spiral for slow-combustion analyses of hydrocarbon mixtures.Weaver and Ledig (7) suggested the use of a fine platinum spiral in a Pyrex or quartz capillary tube for the analysis of small quantities of combustible gases. Bayley (1) described a pipet into which the gas was admitted through a small platinum jet in the side of the pipet directly onto a heated platinum spiral. He claimed that the danger of explosion was less with this apparatus, since mixing was much better. Matuszak (5) employed a pipet with the upper portion terminating in a cone containing an inverted V-type of platinum coil. Porter and Cryder (

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A Simplified Combustion Pipet

Nelson¹,

Weihe²,

Lynch³

1939

Ind. Eng. Chem. Anal. Ed.

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A Flask for Efficient Stirring

Morton¹

1939

Ind. Eng. Chem. Anal. Ed.

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Selective Determination of TNT in Soil Extracts by Sequential Injection Spectrophotometry

et al. 1999

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A rapid sequential injection spectrophotometric method for the selective determination of 2,4,6-trinitrotoluene (TNT) in soil samples is presented. The method is based on a derivatization reaction of TNT with sodium sulfite in a basic acetone medium. The reaction conditions, namely the percentage of acetone used in the reaction, the sample and reagent volumes, the mixing coil volume, and the reaction time, were optimized. The reaction was found to be particularly sensitive to the concentration of acetone; an acetone/water medium of 88% (v/v) acetone was found to be optimal. A study of the response of the method to other explosives demonstrated that the method is selective for TNT. In particular, it was shown that the method had little (<2%) or no response to other secondary explosives such as 2,4- or 2,6-dinitrotoluene (DNT). An average precision of 6.1% RSD was established for five soil samples (n = 4). The limit of detection was 0.5 μg mL-1 for aqueous standards and 80 μg g-1 for ∼300 mg soil samples. Analysis time was approximately three minutes per sample. Quantitative results from the determination of TNT in authentic contaminated soil samples compared favorably to those obtained using a standard method. The extension of the method to water samples and the means by which samples can be preconcentrated on-line using solid-phase extraction (SPE) techniques are discussed.

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An Improved Slow-Combustion Pipet for Gas Analysis

Abstract: Faint pink Orange red No change Orange yellow Red 2,4,6-Trintrobenzoic acid Red Pink Red Red Pink Pink 2,4,6-Trinitrobenzaldehyde Brownish red Faint brownish red Brownish red Brownish red Brownish red Brownish red 2,4,6-Trinitrophenylhydrazine Brownish red

Cited by 3 publications

References 6 publications

A Simplified Combustion Pipet

A Simplified Combustion Pipet

A Flask for Efficient Stirring

Selective Determination of TNT in Soil Extracts by Sequential Injection Spectrophotometry

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