| 摘要 |
PURPOSE:To simplify analytical procedure for quantitative determination of metal contained in an oily substance by using powdery aluminosilicate in a specified condition. CONSTITUTION:A specified amt. of sample oil is weighed on a Pt dish. An auxiliary agent for determination comprising alumino-silicate powder satisfying <=0.1g/ml bulk density (BD) and >=50m<2>/g specific surface area (SA), or 0.1g/ml <BD<=0.5g/ml and >=100m<2>/g SA is added to absorb the sample oil. The auxiliary determination agent having absorbed the oil is then heated together with the Pt dish on a hot plate to carbonize until vaporization of hydrocarbon ceases and the gloss of the sample disappears. Further, the carbonized product is transferred into an electric furnace and is converted to ash at 525 deg.C+ or -25 deg.C until the blackness of the carbonized product disppears. Then, the Pt dish is cooled to RT at the outside of the furnace. For the determination of Ni, HNO3 and HF are added and the sample is heated to dryness on a hot plate. Further procedures are performed in accordance with the standard regulated by the Japan Petroleum Society. |
