CAJ | 학술논문

基于I_3~-与罗丹明B在OP存在下结合成电中性的离子缔合物在360 nm波长处有最大吸收,提出了水样中溶解氧的光度法测定.于待测水样中加入硫酸锰及碱性碘化钾溶液,水中溶解氧与之形成Mn_2O_3沉淀,加入浓硫酸使与Mn_2O_3沉淀反应而析出单质碘,在酸性条件下析出的碘与罗丹明B溶液在360 nm波长处有最大吸收,以碘酸钾为基准物,对水样中溶解氧含量进行分光光度法测定.溶解氧浓度在0.002 7～0.686 mg/L范围内符合比尔定律,表观摩尔吸光系数为4.012×10~4 L·cm~(-1)·mol~(-1),方法的检出限为0.0010mg/L.此法对不同来源的水样中溶解氧含量进行测定,所得结果与碘量法及溶解氧测定仪所测得的结果相符合.
기우I_3~-여라단명B재OP존재하결합성전중성적리자체합물재360 nm파장처유최대흡수,제출료수양중용해양적광도법측정.우대측수양중가입류산맹급감성전화갑용액,수중용해양여지형성Mn_2O_3침정,가입농류산사여Mn_2O_3침정반응이석출단질전,재산성조건하석출적전여라단명B용액재360 nm파장처유최대흡수,이전산갑위기준물,대수양중용해양함량진행분광광도법측정.용해양농도재0.002 7～0.686 mg/L범위내부합비이정률,표관마이흡광계수위4.012×10~4 L·cm~(-1)·mol~(-1),방법적검출한위0.0010mg/L.차법대불동래원적수양중용해양함량진행측정,소득결과여전량법급용해양측정의소측득적결과상부합.
Based on the reaction between iodine and rhodamine B which produced a ion-association complex with its absorption maximum at the wavelength of 360 nm, a photometric determination of dissolved oxygen in water was proposed. Dissolved oxygen in the sample was precipitated by adding MnSO_4 in an alkaline medium to form Mn_2O_3 from which oxygen was liberated upon addition of H_2SO_4, and reacted with the free I_2 liberated by the reaction of KI with H_2SO_4. The absorbance of ion-association complex was measured photometrically at 360 nm. The content of dissolved oxygen was found from the standard curve drawn by using KIO_3 standard solution as reference. Beer's law was kept in the range of 0. 002 7-0. 686 mg/L dissolved oxygen. The apparent molar absorption coeffi-water samples, results obtained by this method were in consistency with the results obtained by io-dometry and by the dissolved-oxygen determinator.