潤滑油中のイオウ,カルシウムおよびバリウムのケイ光X線による迅速同時定量法

概要

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A rapid method of simultaneous determination of sulfur, calcium, and barium in lubricating oils by fluorescent X-ray was examined. The result showed that the base oils in lubricating oils gave a remarkable influence, and it was removed by making the IB-value constant as well as by using it as the internal standard. The matrix effect of sulfur was examined in its concentration of 0.3 to 3.0 wt%. Values of calcium and barium were affected by the matrix effect in the ranges of 0.023 to 0.12 wt% of calcium and 0.038 to 0.268 wt% of barium, respectively. On the contrary, sulfur was not affected by calcium and barium in their ranges described above. Consequently, calcium and barium were determined by their calibration curves prepared using the calibrated values of sulfur. The precisions of the proposed method was comparable with that of the conventional one. The average deviations were 0.014 to 0.042 wt% for 0.32 to 3.20 wt% S, 0.000 to 0.001 wt% for 0.023 to 0.140 wt% Ca and 0.001 to 0.002 wt% for 0.038 to 0.268 wt% Ba, respectively.
社団法人日本分析化学会の論文