Comparison of chemical and physical properties of carbon blacks for sampling and analysis of environmental pollutants

Abstract

SummarySome of the most commonly employed carbon blacks (Carbograph 1, 2, 4, 5 from Lara and Carbopack X from Supelco), were evaluated by the BET surface characterization method for pore size distribution, porosity and specific surface. This information is often incomplete as furnished by manufacturers and is needed for a deeper understanding of carbon adsorption properties in chromatography.The data on surface characterization were obtained before and after graphitisation treatment (except for Carbopack X which cou Id not be obtained in non-graphitized form). The natu re of the active sites present on these carbons was investigated by BETanalysis, atomic absorption and FT-IR.

Сравнение Возможностей Углеродных Сорбционно-Активных Материалов Для Экспрессного Концентрирования Летучих Органических Соединений Из Потока Анализируемого Воздуха

“…В этом отношении предпочтительнее динамическая ТФЭ, основанная на пропускании анализируемого газа через колонку с сорбентом, с последующей термодесорбцией или десорбцией органическим растворителем аналитов и их хроматографическим определением [2,3,7]. К настоящему времени для реализации ТФЭ предложены самые различные сорбенты [8][9][10][11], включая углеродные и наноуглеродные [10] с различной удельной поверхностью и гидрофобностью. Однако углеродные и особенно наноуглеродные сорбционно-активные материалы имеют один существенный недостаток.…”

Discussion of thermodynamic data obtained by adsorption gas chromatography on carbograph 6

“…Carbograph 6 has an effective [10] surface area after graphitization of 203 m 2 g 1, twice that of Carbopack B or Carbograph 1, adsorbents widely employed in gas-liquid-solid chromatography and in sample preparation [11 17]. Its surface area is also greater than that of Carbo-graph 4 and of the same order as that of Carbograph 5 [9,10,18].…”

“…Its surface area is also greater than that of Carbo-graph 4 and of the same order as that of Carbograph 5 [9,10,18]. It might, therefore, have interesting applications in sampling and analysis of the most volatile organic compounds.…”