Phenothalein deoxyribonucleic acid(DNA) cetyltrimethyl ammonium bromide(CTMAB) system has been studied by resonance light scattering(RLS). In Tris HCl buffer solution(pH=9 30), phenothalein and DNA react with CTMAB to...Phenothalein deoxyribonucleic acid(DNA) cetyltrimethyl ammonium bromide(CTMAB) system has been studied by resonance light scattering(RLS). In Tris HCl buffer solution(pH=9 30), phenothalein and DNA react with CTMAB to form large particles of ion association complex, which results in significant enhancement of RLS intensity. The spectral characteristics of RLS, the effective factors and optimum conditions of the reaction have been investigated. Under optimum conditions, the enhanced RLS intensity was proportional to the concentration of DNA in the range of 0 04 to 0 8 mg/L for fish sperm DNA( fsDNA ) and 0 03 to 2 5 mg/L for calf thymus DNA(ctDNA). The detection limits were 12 0 μg/L and 17 0 μg/L for fsDNA and ctDNA, respectively.展开更多
In alkaline conditions,Sodium doecyl sulfate and Bromide hexadecyltrimethyl-ammonium(CTMAB)-Trypan blue(TB) occur faded response to form blue ion compounds.The maximum faded wavelength at 564nm.The apparent molar abso...In alkaline conditions,Sodium doecyl sulfate and Bromide hexadecyltrimethyl-ammonium(CTMAB)-Trypan blue(TB) occur faded response to form blue ion compounds.The maximum faded wavelength at 564nm.The apparent molar absorptivities(ε) is 2.73×104 L·mol-1·cm-1.The linear ranges is 0～7.21mg/L.The concentration of Sodium doecyl sulfate in definite range obeys Beer’s law.A new spectrophotometric method for the determination of Sodium doecyl sulfate has been developed.The method was applied to determine the content of the anion surface active agent Sodium doecyl sulfate in landfill leachate with satisfactory results.展开更多
文摘Phenothalein deoxyribonucleic acid(DNA) cetyltrimethyl ammonium bromide(CTMAB) system has been studied by resonance light scattering(RLS). In Tris HCl buffer solution(pH=9 30), phenothalein and DNA react with CTMAB to form large particles of ion association complex, which results in significant enhancement of RLS intensity. The spectral characteristics of RLS, the effective factors and optimum conditions of the reaction have been investigated. Under optimum conditions, the enhanced RLS intensity was proportional to the concentration of DNA in the range of 0 04 to 0 8 mg/L for fish sperm DNA( fsDNA ) and 0 03 to 2 5 mg/L for calf thymus DNA(ctDNA). The detection limits were 12 0 μg/L and 17 0 μg/L for fsDNA and ctDNA, respectively.
文摘In alkaline conditions,Sodium doecyl sulfate and Bromide hexadecyltrimethyl-ammonium(CTMAB)-Trypan blue(TB) occur faded response to form blue ion compounds.The maximum faded wavelength at 564nm.The apparent molar absorptivities(ε) is 2.73×104 L·mol-1·cm-1.The linear ranges is 0～7.21mg/L.The concentration of Sodium doecyl sulfate in definite range obeys Beer’s law.A new spectrophotometric method for the determination of Sodium doecyl sulfate has been developed.The method was applied to determine the content of the anion surface active agent Sodium doecyl sulfate in landfill leachate with satisfactory results.
