Standardisation Of Gas Chromatographic Analytical Method For Determination Of Residual Naphthalene In Coal Tar Pitch

摘要

In this study the analytical condition for naphthalene in coal tar pitch was evolved and few salient aspects were evaluated. The objective of the study was to develop gas chromatographic analytical method for determination of naphthalene in coal tar pitch setting various parameters, such as suitable solvent, quantity of pitch and naphthalene. The optimum quantity of pitch was found to be 125 mg and the analysed naphthalene value was close to the theoretically expected value. As far as the quantity of the pitch required to be considered for extraction and analysis appears to be 100 mg as optimum and the solvent quantity was found to be 10 mL. The variation in naphthalene value was found to be very less, in all variation (0, 9.0, 12.0, 16.0, 22.5 and 25 mg), only between 12 and 16 mg there was consistently less variation in all the three solvent. The variation was+ 0.17 to+ 0.5% (heptane and n-hexane) and + 0.05 to 0.40 (CS_2). The optimum quantity of the naphthalene shall be considered for analysis in these conditions is 12 mg/100 g pitch.