This paper describes the atomic absorption method in which the pyrogallol is used as releasing agent to assay directly the trace amount of calcium in calcium tungstate in air-acetylene flame.
本文选用了焦（?）酚作释放剂，在空气—乙炔火焰中直接测定钨酸中的微量钙。
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The above products have all been approved the certificates of production licence, flame-proof certification, safe mare licence and scientific and technologic new product assay certification and so on.