Abstract：The content of organic carbon is an important parameter in the process of searching for uranium-bearing rocks. Therefore, it is of great significance for the determination of organic carbon in uranium-bearing rocks. Considering that the content of graphite carbon in uranium-bearing rock is relatively low and can be ignored, so the inorganic carbon in sample was acidified with hydrochloric acid followed by heating to remove inorganic carbon via volatilization. Then the carbon content in sample after pretreatment was determined by high frequency combustion infrared absorption method. The content of organic carbon in sample could be obtained by calculating the mass ratio of sample before and after pretreatment. Consequently the determination method of organic carbon in uranium-bearing rock by high frequency combustion infrared absorption was established. There were few standard samples of organic carbon in uranium-bearing rocks. The efficiency of high frequency infrared carbon sulfur analyzer in sample fusion and carbon release was high. Meanwhile, in order to reduce the system error or accidental error in the test process, the total carbon certified values of stream sediment standard sample and soil standard sample were selected to draw the calibration curve. The results showed that the correlation coefficient of calibration curve was 0.9997. The limit of detection was 0.00080%, and the limit of quantification was 0.0027%. The content of organic carbon in standard sample of uranium rock was determined according to the experimental method. The relative error of determination results was 1.3%, which was lower than the allowable limit of relative error specified in <The specification of testing quality management for geological laboratories> (DZ/T 0130-2006). The proposed method was applied for the determination of organic carbon in actual sample of uranium-bearing rock. The relative standard deviations (RSD, n=5) of results were between 2.1% and 3.8%. The measured results were consistent with those obtained by non-aqueous titration method.
孔玉清.岩矿样中有机炭测定方法的改进[J].理化检验化学分册(Physical Testing and Chemical Analysis Part B:Chemical Analysis),2000,36(1):46-47.
[2]
董炎青,陈英,陈勇,等.重铬酸钾-烘箱加热法测定土壤有机碳研究[J].常州大学学报:自然科学版,2019,31(1):15-20.DONG Yan-qing,CHEN Ying,CHEN Yong,et al.Study on the determination of soil organic carbon by potssium dichromate-dryer heating method[J].Journal of Changzhou University:Natural Science Edition,2019,31(1):15-20.
[3]
刘军根,周清,汪文俊.重铬酸钾容量法测定土壤有机质含量加热消解方法对比分析研究[J].中国化工贸易(China Chemical Trade),2017,36(9):212,215.
[4]
双龙,妮萨娜,杜江,等.重铬酸钾氧化-外加热法测定化探土壤样品中有机碳含量[J].安徽化工,2016,42(4):110-112.SHUANG Long,NI Sa-na,DU Jiang,et al.Determination of organic carbon in geochemical soil sample by postassium dichromate oxidation-heating method[J].Anhui Chemical Industry,2016,42(4):110-112.
[5]
宋瑞强.氧化还原容量法测定海洋沉积物中有机碳的主要影响因子及消除方法[J].仪器仪表与分析监测,2019(1):36-39.SONG Rui-qiang.Main factors affecting the determination of organic carbon in marine sediments by redox volumetric method and their elimination methods[J].Instrumentation.Analysis.Monitoring,2019(1):36-39.
[6]
李旭冉.重铬酸钾氧化-还原容量法测定海洋沉积物中有机碳的不确定度评定[J].现代农业科技(Modern Agricultural Sciences and Technology),2015(24):207-208.
[7]
朱樱,康友纯,欧阳泉根.非水滴定法连续测定铀矿地质样品中的无机碳和有机碳[J].铀矿地质,2010,26(1):55-59.ZHU Ying,KANG You-chun,OUYANG Quan-gen.The continuously determination of inorganic and organic carbon from samples for uranium geology by non-waterdrop decides[J].Uranium Geology,2010,26(1):55-59.
[8]
胡小明,程国平,王俊格.高锰酸根褪色光度法测定土壤中的有机碳[J].应用化工,2012,41(8):1470-1472.HU Xiao-ming,CHENG Guo-ping,WANG Jun-ge.Determination of organic carbon in soil by permanganate fading spectrophotometry[J].Applied Chemical Industry,2012,41(8):1470-1472.
[9]
王夕云,刘晶,范世华.顺序注射-气体扩散分光光度法测定环境水中无机碳和有机碳[J].冶金分析,2008,28(9):25-29.WANG Xi-yun,LIU Jing,FAN Shi-hua.Gas diffusion separation-sequential injection spectrophotometry for the determination of inorganic and organic carbon in environmental water samples[J].Metallurgical Analysis,2008,28(9):25-29.
[10]
Yeomans J C,Bremner J M.A rapid and precise method for routine determination of organic carbon in soil[J].Communications in Soil Science and Plant Analysis,1988,19(13):1467-1476.
[11]
顾涛,王迪民,杨梅,等.高频红外碳硫仪测定土壤/沉积物中总有机碳研究[J].华南地质与矿产,2015,31(3):306-310.GU Tao,WANG Di-min,YANG Mei,et al.Determination of total organic carbon in soil and sediment by high frequency infrared carbon sulfur analyzer[J].Geology and Mineral Resources of South China,2015,31(3):306-310.
[12]
李英秋,纪新华,吴梅,等.管式炉加热-红外吸收法测定铀金属中碳[J].冶金分析,2015,35(1):59-62.LI Ying-qiu,JI Xin-hua,WU Mei,et al.Determination of carbon in uranium metals by tubular furnace heating-infrared absorption method[J].Metallurgical Analysis,2015,35(1):59-62.
[13]
史世云,温宏利,李冰,等.高频燃烧-红外碳硫仪测定地质样品中的碳和硫[J].岩矿测试,2001,20(4):267-271.SHI Shi-yun,WEN Hong-li,LI Bing,et al.Determination of carbon and sulfur in geogical samples by high frequency IR-absorption spectrometric method[J].Rock and Mineral Analysis,2001,20(4):267-271.
[14]
郑立春,张庸,闫秀芬,等.高频燃烧-红外吸收法测定镍基自熔合金中碳[J].冶金分析,2013,33(11):67-70.ZHENG Li-chun,ZHANG Yong,YAN Xiu-fen,et al.Determination of carbon in nickel-matrix self-fluxing alloy by high frequency-infrared absorption method[J].Metallurgical Analysis,2013,33(11):67-70.
[15]
陈伟锐.影响高频红外碳硫仪测定地质样品中全碳结果因素的研究[J].广东化工,2019,46(4):50-51.CHEN Wei-rui.Study on The factors affecting the determination of total carbon in geological samples by high frequency infrared carbon and sulfur analyzer[J].Guangdong Chemical Industry,2019,46(4):50-51.
[16]
伍耀林.红外吸收与非水滴定法测定硅酸盐岩石总碳的分析与比较[J].东华理工大学学报:自然科学版,2017,40(4):391-394.WU Yao-lin.Analysis and comparison of the total carbon content in silicate rocks by infrared absorption method and nonaqueous titration method[J].Journal of East China University of Technology:Natural Science,2017,40(4):391-394.
[17]
鲁毅,柳洪超,郭国建,等.高频感应燃烧-红外吸收光谱法测定碳化硅中总碳含量[J].理化检验:化学分册(Physical Testing and Chemical Analysis Part B:Chemical Analysis),2015,51(10):1457-1459.
[18]
徐敏秀,何莉,姚凤花,等.高频燃烧红外吸收法测定硅粉中总碳[J].冶金分析,2015,35(9):25-31.XU Min-xiu,HE Li,YAO Feng-hua,et al.Determination of total carbon in silicon powder by high frequency combustion infrared absorption method[J].Metallurgical Analysis,2015,35(9):25-31.
[19]
邓军华,王一凌,亢德华,等.高频燃烧红外吸收法测定磷铁中碳和硫[J].冶金分析,2017,37(3):83-87.DENG Jun-hua,WANG Yi-ling,KANG De-hua,et al.Determination of carbon and sulfur in ferrophosphorus by high frequency combustion infrared absorption method[J].Metallurgical Analysis,2017,37(3):83-87.
[20]
齐东子,陈东平,沈文杰.高频燃烧-红外分析仪测定海洋沉积物的总碳含量[J].理化检验:化学分册(Physical Testing and Chemical Analysis Part B:Chemical Analysis),2019,55(7):791-795.
[21]
李建红,李熹.高频燃烧红外吸收法测定页岩中有机碳[J].煤炭与化工,2015,38(5):137-138.LI Jian-hong,LI Xi.The application of high frequency combustion infrared absorption method in measuring organic carbon in shale[J].Coal and Chemical Industry,2015,38(5):137-138.
[22]
张蕴慧.影响钢铁中碳硫测定结果的几个因素[J].河南化工(Henan Chemical Industry),2010,27(6):61-63.
