標(biāo)準(zhǔn)編號:	GB/T 30921.3-2016
中文名稱:	工業(yè)用精對苯二甲酸（PTA）試驗方法 第3部分：水含量的測定
英文名稱:	Test method of purified terephthalic acid (PTA) for industrial use--Part 3 ： Determination of water content
中標(biāo)分類:	G16    基本有機化工原料
行業(yè)分類:	GB    國家標(biāo)準(zhǔn)
ICS分類:	71.080.40 71.080.40    有機酸 71.080.40
發(fā)布機構(gòu):	中華人民共和國國家質(zhì)量監(jiān)督檢驗檢疫總局 中國國家標(biāo)準(zhǔn)化管理委員會
發(fā)布日期:	2016-06-14
實施日期:	2017-1-1
標(biāo)準(zhǔn)狀態(tài):	valid
翻譯語言:	英文
文件格式:	PDF
中文字符數(shù):	7000 字
翻譯價格(元):	420.0
交付時間:	付款后 1 個工作日

Test method of purified terephthalic acid (PTA) for industrial use— Part 3: Determination of water content Warning: This method does not purport to address all of the safety problems associated with its use. The user is responsible for taking proper safety and health measures and ensuring conformance to the requirements specified in relevant national regulations. 1 Scope This part of GB/T 30921 specifies Karl Fischer volumetric method and thermogravimetry for the determination of water content in purified terephthalic acid (PTA) for industrial use. The Karl Fischer volumetric method in this part is applicable to the determination of moisture with a content of not less than 0.010% (mass fraction) in PTA for industrial use; the thermogravimetry is applicable to the determination of moisture with a content of not less than 0.050% (mass fraction) in PTA for industrial use. 2 Normative references The following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3723 Sampling of chemical products for industrial use—Safety in sampling GB/T 6283 Chemical products—Determination of water—Karl·Fischer method (general method) GB/T 6679 General rules for sampling solid chemical products GB/T 6682 Water for analytical laboratory use—Specification and test methods GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values 3 Karl Fischer volumetric method (arbitration method) 3.1 Method summary The PTA specimen is dissolved in pyridine, and the water existing in the specimen reacts quantitatively with Karl Fischer reagent (solution composed of iodine, sulfur dioxide, pyridine and methanol) with known titre. The water content in the specimen shall be calculated according to the consumed Karl Fischer reagent. Below is the reaction formula:

Foreword i 1 Scope 2 Normative references 3 Karl Fischer volumetric method (arbitration method) 4 Thermogravimetry 5 Repeatability 6 Report