Jiang Zhi-Liang, Zhou Su-Mei, Liang Ai-Hui, Kang Caiyan, He Xingcun
School of Environment and Resource, Guangxi Normal University, Guilin 541004, China.
Environ Sci Technol. 2006 Jul 1;40(13):4286-91. doi: 10.1021/es051949u.
A new resonance scattering method, based on resonance scattering (RS) effect, for the respective determination of ClO2 and Cl2 in water samples was developed. In HCl-NaAc buffer solutions with the pH value of 1.42, chlorine dioxide, or chlorine, oxidizes I- to form 12, which then reacts with the excess I- to form I3-. The resulting 13- would combine, respectively, with four rhodamine(Rh) dyes, including rhodamine B (RhB), butyl rhodamine B (b-RhB), rhodamine 6G (RhG), and rhodamine S (RhS), to form association particles which exhibit a stronger resonance scattering (RS) effect at 420 nm. For four systems of RhB, bRhB, RhG, and RhS, chlorine dioxide was, respectively, determined in the concentration range of 0.0056 to approximately 0.787 mg/L, 0.0034 to approximately 0.396 mg/L, 0.0057 to approximately 0.795 mg/L, and 0.0052 to approximately 0.313 mg/L, with the detection limits of 0.0011 mg/L, 0.006 mg/L, 0.0054 mg/ L, and 0.0023 mg/L ClO2, respectively. At the same experimental conditions as those for the determination of ClO2, chlorine was, respectively, determined in the concentration range of 0.013 to approximately 0.784 mg/L, 0.0136 to approximately 0.522 mg/ L, 0.014 to approximately 0.81 mg/L, and 0.014 to approximately 0.42 mg/L, with the detection limits of 0.0016 mg/L, 0.0104 mg/L, 0.0079 mg/L, and 0.0037 mg/L Cl2, respectively. The total RS value originally from ClO2 and Cl2 was recorded in the buffer solution, while the RS value from ClO2 was obtained by using dimethyl sulfoxide to mask chlorine. Thus the RS value of chlorine was calculated by deducting the RS value of chlorine dioxide from the total RS value. The RhB RS method was chosen for the determination of ClO2 and Cl2 in drinking water, with advantages of high sensitivity, good selectivity, simplicity, rapidity, and convenience.
基于共振散射（RS）效应，开发了一种用于分别测定水样中二氧化氯（ClO₂）和氯气（Cl₂）的新型共振散射方法。在pH值为1.42的HCl-NaAc缓冲溶液中，二氧化氯或氯气将碘离子（I⁻）氧化形成碘（I₂），然后I₂与过量的I⁻反应形成三碘离子（I₃⁻）。生成的I₃⁻会分别与四种罗丹明（Rh）染料，包括罗丹明B（RhB）、丁基罗丹明B（b-RhB）、罗丹明6G（RhG）和罗丹明S（RhS）结合，形成缔合颗粒，这些颗粒在420 nm处表现出更强的共振散射（RS）效应。对于RhB、b-RhB、RhG和RhS四个体系，二氧化氯的测定浓度范围分别为0.0056至约0.787 mg/L、0.0034至约0.396 mg/L、0.0057至约0.795 mg/L和0.0052至约0.313 mg/L，二氧化氯的检测限分别为0.0011 mg/L、0.006 mg/L、0.0054 mg/L和0.0023 mg/L。在与测定二氧化氯相同的实验条件下，氯气的测定浓度范围分别为0.013至约0.784 mg/L、0.0136至约0.522 mg/L、0.014至约0.81 mg/L和0.014至约0.42 mg/L，氯气的检测限分别为0.0016 mg/L、0.0104 mg/L、0.0079 mg/L和0.0037 mg/L。缓冲溶液中记录的是最初来自二氧化氯和氯气的总RS值，而通过使用二甲基亚砜掩蔽氯气来获得来自二氧化氯的RS值。因此，通过从总RS值中扣除二氧化氯的RS值来计算氯气的RS值。选择RhB RS法用于测定饮用水中的二氧化氯和氯气，该方法具有灵敏度高、选择性好、简便、快速和方便等优点。
