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 GB/T 51175-2016  
Technical code for refining fired heater

炼油装置火焰加热炉工程技术规范
 GB/T 30921.4-2016  
Test method of purified terephthalic acid (PTA) for industrial use—Part 4: Determination of titanium content—Diantipyrylmethane photometric method

工业用精对苯二甲酸(PTA)试验方法 第4部分:钛含量的测定 二安替吡啉甲烷分光光度法

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