亚甲基蓝共振散射光谱法测定地下水中亚氯酸根  

Determination of chlorite in water by resonance scattering spectrometry with Methylene blue

作　　者：黄年花 黄思林 陆红叶 马璐[1] 凌绍明 HUANG Nianhua;HUANG Silin;LU Hongye;MA Lu;LING Shaoming(School of Pre-undergraduate Education,Baise University,Baise 533000,China;College of Chemical and Environmental Engineering,Baise University,Baise 533000,China)

机构地区：[1]百色学院预科学院,广西百色533000 [2]百色学院化学与环境工程学院,广西百色533000

出　　处：《工业水处理》2024年第6期198-202,共5页Industrial Water Treatment

基　　金：广西高校中青年教师科研基础能力提升项目(2022KY0738,2023KY0763)。

摘　　要：在CH3COONa-HCl缓冲溶液中,ClO_(2)-氧化过量的I-生成I3-,I3-与带正电荷的亚甲基蓝在静电引力作用下形成缔合物微粒,使体系的共振散射强度增强,据此建立测定水中痕量NaClO_(2)的共振散射光谱新方法。以提高共振散射强度为目标对该方法的测定条件进行了优化,获得了测定时CH3COONa-HCl缓冲溶液、KI溶液、亚甲基蓝溶液的最佳用量及最佳的反应时间和测定波长。在最佳测定条件下,共振散射强度在ClO_(2)-质量浓度0.0182~0.3640 mg/L范围内随其增大而增强,二者呈现良好的线性关系,检出限为0.0048 mg/L。该方法用于测定地下水中ClO_(2)-的含量时,测定结果的相对标准偏差为1.5%~2.9%,回收率为96%~99%。In CH3COONa-HCl buffer solution,ClO_(2)-oxidizes excess I-to generate I3-,and I3-forms complex par-ticles with positively charged methylene blue under electrostatic attraction,which enhances the resonance scattering intensity of the system.Based on this principle,a new method for the determination of trace NaClO_(2) in water by reso-nance scattering spectroscopy was established.The measurement conditions of this method were optimized to im-prove the resonance scattering intensity.The optimal dosage of CH3COONa-HCl buffer solution,KI solution,and methylene blue solution,as well as the optimal reaction time and measurement wavelength,were obtained during the measurement.Under the optimal conditions,the resonance scattering intensity increased with the increase of ClO_(2)-mass concentration in the range of 0.0182-0.3640 mg/L,which showed a good linear relationship with a detection limit of 0.0048 mg/L.When this method was used to determine the content of chlorite in groundwater,the relative standard deviation of the measurement results was 1.5%-2.9%,and the recovery rate was 96%-99%.

关 键 词：亚氯酸根 亚甲基蓝 共振散射光谱法 缔合微粒 

分 类 号：X703[环境科学与工程—环境工程]