Rose Bengal-sensitized Photolysis of γ-Hexachlorocyclohexane in Ice†

doi:10.7503/cjcu20160933

Abstract

Abstract:

Rose bengal(RB)-sensitized photolysis of gamma-hexachlorocyclohexane(γ-HCH) in ice was investigated. The results show that the photosensitizer RB accelerate the photolysis of γ-HCH by the excited state [RB]^* and its product singlet oxygen(¹ $O 2 *$ ), and RB concentration is the most significant factor affecting the photolysis rate; the sensitized photolysis of γ-HCH at lower initial concentrations on the μg/L scale is faster; the type and concentration of inorganic salts can change the proportion of liquid like layer(LLL) on the surface of ice and thus affect the photolysis of γ-HCH. Based on the results above, the photoproducts were analyzed and the sensitized photolysis mechanism of γ-HCH in the presence of RB was proposed.

Key words: γ-Hexachlorocyclohexane(γ-HCH), Rose bengal, Ice, Photosensitization Photolysis

CLC Number:

O644

TrendMD:

CHEN Baiyan, KANG Chunli, WU Jiayu, WANG Yixue, GUO Zhixin, BAO Siqi, ZHONG Yubo, TIAN Tao, XUE Honghai. Rose Bengal-sensitized Photolysis of γ-Hexachlorocyclohexane in Ice^†[J]. Chem. J. Chinese Universities, 2017, 38(5): 791.

Figures/Tables 8

Fig.1 Effects of different phosphate buffer concentrations on the direct photolysis of γ-HCH in icec0(γ-HCH)=60 μg/L. (A) c(PBS)=0.005 mol/L;(B) c(BPS)=0.05 mol/L. a. pH=6; b. pH=8; c. no adjustment.

Fig.2 Effects of the initial concentration of RB on the photolysis of γ-HCH in icec0(γ-HCH)=60 μg/L, c(PBS)=0.005 mol/L. (A) pH=6; (B) pH=8.c(RB)/(mg·L-1): a. 0; b. 2.5; c. 5.0; d. 10.0; e. 20.0.

Fig.3 Effects of the initial concentration of γ-HCH on its photolysis in icec(RB)=10 mg/L, c(PBS)=0.005 mol/L. (A) pH=6; (B) pH=8. c0(γ-HCH)/(μg·L-1): a. 20; b. 60; c. 200; d. 600.

Fig.4 Effects of the phosphate buffer concentration on the photolysis of γ-HCH in icec0(γ-HCH)=60 μg/L, c(RB)=10 mg/L. (A) pH=6; (B) pH=8. c(PBS)/(mol·L-1): a. 0.005; b. 0.010; c. 0.055.

Fig.5 Effects of the sodium sulfate concentration on the photolysis of γ-HCH in icec0(γ-HCH)=60 μg/L, c(RB)=10 mg/L, c(PBS)=0.005 mol/L. (A) pH=6; (B) pH=8.c(Na2SO4)/(mol·L-1): a. 0; b. 0.005; c. 0.050.

Fig.6 Effects of the sodium azide concentration on the photolysis of γ-HCH in ice at normal and deoxygenated conditionsc0(γ-HCH)=60 μg/L, c(RB)=10 mg/L, c(PBS)=0.005 mol/L. (A) pH=6; (B) pH=8. c(NaN3)/(mol·L-1): a. 0; b. 0.005; c. 0.050.

Fig.7 Effects of temperature on the photolysis of γ-HCH in ice at normal(A, B) and deoxygenated(C, D) conditionsc0(γ-HCH)=60 μg/L, c(RB)=10 mg/L, c(PBS)=0.005 mol/L. (A),(C) pH=6; (B), (D) pH=8.Temperature/K: a. 263; b. 256; c. 248.

Scheme 1 Mechanism of RB-sensitized photolysis of γ-HCH in ice

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