Spectrophotometric Determination of Calcium in Cast Iron. (Determination of Small Amounts of Special Elements in Cast Iron, 5th Report)

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  • 鋳鉄中カルシウムの光度定量法
  • チュウテツ チュウ カルシウム ノ コウド テイリョウホウ

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Fundamental conditions of photometric method of calcium using plasmo corinth dye (sodium 1-hydroxy-4-chloro-2,2-diazobenzene-1,8-dihydroxynaphthalene-3,6-disulfonate) have been investigated and applied to the analysis of cast iron. The absorbancy of calcium-plasmo corinth complex is measured at 620 mμ and stable at least for 1 hour. Since the absorbancy is the maximum on the blank solution without calcium and decreases with increase of calcium, the working curve is prepared against the decrease in absorbancy instead of usual one. Optimum concentration of NaOH and the dye are respectively 1 N and 0.002%. The dye reagent can be preservable at least for 50 hours without change. The color of complex obeys Beer’s law up to 60γ of calcium in 50 mL for 1 cm cell. Prior to the photometric determination of calcium, iron is extracted off with isopropyl ether at 8 N solution of hydrochloric acid and then calcium is precipitated as oxalate from homogeneous soution using urea. The proposed method is suitable for 0.001∼0.06 of calcium in cast iron.

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