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The effects of Cu2+ on the catalytical degradation of acid chrome blue K (ACBK) in UV-TiO2 and H2O2 processes were studied. In these two processes, Cu2+ markedly depressed the catalytical degradation of ACBK by its interaction with ACBK. Through this interaction, the new complex Cu(ACBK)2 formed. The formation of this new complex was favorable to protect some groups in ACBK from the oxidation of reactive oxygen generated in UV-TiO2 and H2O2 processes, and consequently had suppressing effects on degradation of ACBK. In addition, Cu2+ also inhibited the degradation of ACBK in UV-TiO2 process by influencing the adsorption of ACBK on the surface of TiO2 particles.

(III), Hg(II), F', B40 72‘, C IO /, oxalate, d trate and tartrate do not. Acid chrome blue K [C.I., - 3 to 5 Mordant blue 31(1)] (I) blue Sulphonazo {bis[3-(8- amino-l-hydroxy-3,6- disulpho-2-naphthylazo)- 4-hydroxyphenyl] Sulphone} (II) Benzoic acid 410 nm 1.5 to Salicylhydrazide e=5700 2.5 5.5 to 7.5M H 3P ° 4 Ethopropazine hydrochloride 510 nm Reagems I and II are recommended for deter- 86 mination of V in products of the aluminium magnesium industry. The sensitivities for de­ termining V(IV) are 3.2 ng/ml for I and 4 ng/ ml for II. Beer’s law is obeyed for V

Chrome Blue K (ACBK), Chlorophosphonazo I (CPAI), Arsennazo I (AAI) and Chromotrope 2R (CT2R), and other monoazo dye signals are 0.010–0.030mg/L; the sensitivity range in sequence is CALKS>AAI>CPAI>ACBK> CT2R>ACDB> CBSE [16]. Li studied that in an acidic medium with pH 0.6–2.0, the enhanced light scatter- ing signal for proteins and azo dyes, such as orange red G, methyl orange, methyl red, and orange yellow G for the detection of BSA, HSA, and alpha-chymotrypsin (Chy), detection limits are 2.6 × 10–3, 3.4 × 10–3, and 7.1 × 10–3mg/L, respectively, where orange red G

in A-G