基于电导率差值法测定烟叶中钾含量的方法研究  

Study on Determination Method of Potassium Content in Tobacco Leaves Based on Conductivity Difference Method

作　　者：周权 张闪烁 陈旭初[3] 孙颖琦 许战洪 郭传滨 于飞勇 姜山 李昂 吴俊林 郝浩浩 贾峰[6] ZHOU Quan;ZHANG Shanshuo;CHEN Xuchu;SUN Yingqi;XU Zhanhong;GUO Chuanbin;YU Feiyong;JIANG Shan;LI Ang;WU Junlin;HAO Haohao;JIA Feng(Biyang Branch of Zhumadian Tobacco Company,Biyang Henan 463700;Henan GRGMetrology&Test Co.,Ltd.,Zhengzhou Henan 450001;Pingdingshan Branch of Henan Tobacco Company,Pingdingshan Henan 467000;Zhumadian Cigarette Factory,Henan China Tobacco Industry Co.,Ltd.,Zhumadian Henan 463000;Zhumadian Branch of Henan Tobacco Company,Zhumadian Henan 463000;College of Biological Engineering,Henan University of Technology,Zhengzhou Henan 450001)

机构地区：[1]驻马店市烟草公司泌阳县分公司,河南泌阳463700 [2]河南广电计量检测有限公司,河南郑州450001 [3]河南省烟草公司平顶山市公司,河南平顶山467000 [4]河南中烟工业有限责任公司驻马店卷烟厂,河南驻马店463000 [5]河南省烟草公司驻马店市公司,河南驻马店463000 [6]河南工业大学生物工程学院,河南郑州450001

出　　处：《现代农业科技》2021年第24期188-191,共4页Modern Agricultural Science and Technology

基　　金：河南省驻马店市烟草公司科技项目“高效解钾菌的粉状菌肥的开发及推广应用”(202041170020007);上海烟草集团有限责任公司科技项目(2020310000140580)。

摘　　要：本研究建立了采用电导率差值检测烟叶中钾含量的方法。该方法利用溶液中钾离子与四苯硼钠反应后形成四苯硼钾沉淀,通过检测待测溶液反应前后溶液的电导率变化,计算出待测溶液中的钾离子含量。结果表明,利用KCl与四苯硼钠反应后,溶液电导率下降值与钾含量成正相关。在25℃条件下,钾离子浓度在0~596 mg/L范围内,标准曲线为y=1.180 2x。通过向提取液中添加一定质量的钾,计算得出钾回收率在98.66%~101.01%之间,表明该方法有较高的准确度。该方法结果与传统沉淀法检测结果基本一致,该方法检测值比火焰光度法检测的结果偏高,但重复性较好。This study established a method to detect the potassium content of tobacco leaves by using the conductivity dif-ference method. Based on the principle that potassium ions in the solution can react with sodium tetraphenylborate to form potass-ium tetraphenylborate precipitation, the potassium ion content in the solution was calculated by detecting the change in conduc-tivity of the solution before and after the reaction. The results showed that after KCl reacted with sodium tetraphenylborate, the decrease value of solution conductivity was positively correlated with the potassium content. Under the condition of 25 ℃, the potassium ion concentration was in the range of 0-596 mg/L, the standard curve was y=1.180 2 x. By adding a certain amount of potassium to the extract, the potassium recovery rate was calculated to be 98.66%~101.01%, indicating that the method had high accuracy. The results of this method were basically the same as that of the traditional precipitation method. The detection values of this method were higher than that of the flame photometric method, but the repeatability was better.

关 键 词：钾含量 电导率差值法 烟叶 四苯硼钠 四苯硼钾 

分 类 号：TS411[农业科学—烟草工业]