摘要
在ｐＨ９．５的ＮＨ４Ｃｌ－ＮＨ３·Ｈ２Ｏ介质和表面活性剂ＣＰＣ及ＯＰ存在下，锰和５－Ｂｒ－ＰＡＮ－６Ｓ形成１∶２的紫红色配合物．其最大吸收波长在５９０ｎｍ处，表观摩尔吸光系数为２．１８×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，以半胱氨酸和氟化铵作掩蔽剂，直接测定茶汤中痕量锰．结果满意．
The chromogenic reaction of 5 Br PAN 6S with manganese(Ⅱ) in the presence of CPC and OP as surfactant agents has been studied. It is found that the reagent is highly sensitivity for the direct determination of trace manganese(Ⅱ). The complex of manganese(Ⅱ)with 5 Br PAN 6S (1∶2) is formed at room temperature and pH 9.5. It is stable for 5 hours. The apparent molar absorptivity is 2.18×10 5L·mol -1 ·cm -1 and Beers Law is obeyed in the range of 0￣10.0μg Mn(Ⅱ) per 25mL. The interference of foreign ions is examined in the presence and absence of the the masking agent such as Lcysteine and ammonium fluoride. This method has been successfully applied to determine the trace manganese in tea. The result obtained is agreed with by AAS.
出处
《分析科学学报》
CAS
CSCD
1997年第2期148-150,共3页
Journal of Analytical Science
基金
浙江省分析测试基金
