摘要
采用离子色谱法测定进口煤炭中氟及氯元素含量,对氟及氯标准溶液线性关系和方法检出限、方法精密度、方法适用性等进行探讨及研究,建立了氧弹燃烧-离子色谱法测定煤中氟及氯的方法;探讨淋洗液流速、称样量和吸收时间对煤中氟及氯含量的影响;同时比较离子色谱法和硫氰酸钾滴定法对煤中氯含量的影响。研究结果表明,采用AS-19型阴离子分离柱,30.00 mmol/L氢氧化钠为淋洗液,自动再生抑制型电导检测器检测,外标法测定煤中氟及氯的含量,方法简单快速,使用试剂少,精密度、准确度均满足标准方法中的相关要求;煤中氟及氯的最佳测定条件为:淋洗液流速为1 mL/min,称样量为0.7 g,吸收时间为30 min;通过比较离子色谱法和滴定法,发现两者无明显区别。
The oxygen bomb combustion and ion chromatography method was developed for the determination of the content of fluorine and chlorine in imported coal. The linear relation, method detection limit, precision limit and applicability of the method were discussed and researched. The influence of eluent flow rate, sample mass and absorption time on the content of fluorine and chlorine was investigated, the effect of ion chromatography and potassium thiocyanate titration on the content of fluorine and chlorine was compared. Research results show that the method for determination the content of fluoride and chlorine, selecting Dionex AS-19 anion analysis column, and taking 30 mmol/L NaOH as leaching liquid, using automatiomatical regeneration inhibit type conductance detection device and external standard method, is simple, fast and small dosage of reagents, and precision and accuracy could meet the related requirements respectively; the obtained optimum conditions are the eluent flow rate is 1mL/min, the sample mass is 0.7 g, the absorption time is 30 min;the determination results of the content of fluorine and chlorine by ion chromatography and potassium thiocyanate titration are coincident.
作者
娄丽
郭雨时
郝陶光
申宏杰
由礼
Lou Li Guo Yushi Hao Taoguang Shen Hongjie You Li(Dandong Entry-Exit Inspection and Quarantine Bureau, Dandong 118000, China)
出处
《煤炭与化工》
CAS
2017年第4期80-84,共5页
Coal and Chemical Industry
关键词
煤炭
氟
氯
离子色谱法
coal
fluorine
chlorine
ion chromatography
