CeF_3 沈殿分離-炎光分析法による低水素系溶接棒被覆剤ならびに同原料中の F の間接定量

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An indirect determination of F by flame emission spectrometry was studied. After a sample was fused with Na_2CO_3, F was precipitated as CeF_3, and Ce in CeF_3 which was separated by filtering was determined by flame emission spectrometry in a nitrous oxide-acetylene flame. The intensity of Ce in the concentration range of 0 to 1200 ppm was measured at 520nm, and was increased by adding Sr. When the minimum of CH_3COONH_4 which was necessary to precipitate CeF_3 rapidly was added to the solution, co-precipitated cerous acetate could be dissolved by washing with NH_4NO_3 solution when filtering the precipitate. The recovery of 5mg or over F was 98-102%. This method was successfully applied to the determination of F in the coating of the low hydrogen type of electrode, fluorides of alkaline earth metals, and cryolite. The reproducibility (coefficient of variation) of the results was 1.46-3.48%.
社団法人日本鉄鋼協会の論文
1976-07-01