he determination of tin(Ⅳ)is based on the formation of a red complex between tin(Ⅳ)and o-hydroxy-naphthyl fluorone in the presence of DDMAB and dilute sulphuric acid medium.The absorbance of the complex is measured at 505nm against a reagent blank with molar absorp-tivity of 1.64×10￣5L·mol￣-1.cm￣-1.The molar ratio of tin(Ⅳ)to o-HNF is estaHbhed as 1:2.Beer’s law is obeyed in the range 0～0. 4 8μg/ml Sn(Ⅳ),The method has been applied to the de-termin...
