二苯基羰酰二肼

更多植物激素及核酸类
试剂二苯基羰酰二肼均包邮，浙沪赣皖鲁京等地隔天到，川云黔津沪渝黑吉辽陕甘三天左右到，蒙新藏青等边远地区五天左右到。
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产品规格： AR
包　　装： 25克
CAS号：140-22-7
二苯基羰酰二肼C13H14N4O=242.28
级别：AR
熔点：170～174℃
铬酸盐络合物摩尔吸收系数，ε/（L/cm·mol）：≥3.8×104
乙醇溶解试验：合格
灼烧残渣（硫酸盐计）：≤0.10%
性状：白色或浅粉红色结晶性粉未，露置空气中逐渐变为红色。微溶于水（～0.024g/100ml），不溶于酶，溶于乙醇、丙酮等其它有机溶剂。溶液比固体易，逐渐变为黄和棕色。试剂和多种金属发生有色反应：Ag+（紫）、Ni2+（蓝）Pb2+（橙蓝）。试剂与CrO42-的反应机理至今还不*清楚，有人认为是二苯碳酰二肼由CrO42-氧化为二苯缩氨基脲，后者再与Cr3+形成络合。所形成的络合物阳离子与Cl-结合成离子对，可为戊醇萃取。Cu2+、Fe2+、Hg+、Hg2+、Se4+和TcO4-与试剂反应的原理类似于CrO42-的反应，即氧化还原和络合反应
用途：生化研究。滴定铁时作指示剂。比色测定铬、汞和铅，检测镉、汞、镁、醛类和土根碱。测定重铬酸盐的氯化还原指示剂。汞量法测定和的吸附指示剂。（ 用作分光光度法测定铬的显色剂及检定Cu2+、Fe3+、Hg2+等的显色剂。还用作氧化还原、吸附及配合滴定的指示剂。）
保存：RT，避光
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