排序方式: 共有25条查询结果,搜索用时 15 毫秒
1.
流动注射化学发光法测定工业废水中苯酚 总被引:2,自引:0,他引:2
采用流动注射技术,研究了高锰酸钾-过氧化氢-苯酚的化学发光行为,对影响化学发光强度的因素进行了试验,建立了流动注射化学发光法测定苯酚的方法。方法的检出限为3×10-5g.L-1,线性范围为1.0×10-4~1.0×10-1g.L,对浓度为4.0×10-4g.L的苯酚作试验,求得其相对标准偏差(n=11)值为1.6%。方法用于废水中苯酚含量的测定,结果与分光光度法测得值一致。 相似文献
2.
二水草酸锌脱水的热分解动力学研究 总被引:10,自引:0,他引:10
提出一种多升温速率-等温法确定机理函数g(α)的新方法;并用迭代的等转化率法求出较为可靠的活化能Ea;在Ea和g(α)的基础上计算出指前因子A.用该法对二水草酸锌(ZnC2O4•2H2O)脱水反应的热分解动力学三因子进行了求算,得出Ea为87.22 kJ•mol-1, A为4.2120×108~7.2328×108 s-1;以及随机成核和随后生长型机理函数Am(Avrami-Erofeer),其积分形式g(α)=[-ln(1-α)] 1/m和微分形式f(α)=m(1-α)•[-ln(1-α)](1-1/m),调节因子m=1.85~2.00. 相似文献
3.
邻位吡啶自由基多通道分解反应的动力学和反应机理研究 总被引:1,自引:0,他引:1
Utilizing Gaussian94 program package, all species involved in decomposition reactions of o-pyridyl radical were optimized fully at B3LYP/6-311++G^** level. Intrinsic reaction coordinate calculations were employed to confirm the connections of the transition states and products, and transition states were ascertained by the number of imaginary frequency (0 or 1). The reaction mechanism was elucidated by the vibrational mode analysis and electronic population analysis, and the reaction rate constants were calculated with transition state theory. 相似文献
4.
Neutral aluminium alkyls are well known to act as ethylene oligomerization and polymerization catalysts and cocatalysts.On the basis of the full optimization of alkylaluminium compounds with Gaussian 98 program package at the B3LYP/6-31G** level,the selected structures and bonding energies were investigated extensively.The geometries and bonding energies of AlR3(R = H,CH3,C2H5,C3H7,C4H9) and Al(C2H5)2R'(R' = C2H5,C3H7,C4H9,C5H11,C6H13) were investigated extensively,and we found that,along with the prolongation of carbon chains the terminal C-C bond is shortened gradually until to a constant value of about 0.1532 nm in C4H9;and the bonding energy almost remains constant.The dative bonding of C2H4 to Al(C2H5)3,whose bonding energy is only 15.30 kJ/mol,is very weak. 相似文献
5.
6.
毛细管电泳-联吡啶钌电化学发光法对血浆中丁卡因与普鲁卡因的同时测定 总被引:4,自引:1,他引:3
建立了毛细管电泳-电致化学发光同时测定丁卡因和普鲁卡因的新方法.考察了毛细管电泳流动相和检测池中磷酸盐缓冲液pH和浓度、进样时间和电压、分离电压和检测电位等对丁卡因和普鲁卡因的分离以及联吡啶钌电致化学发光检测的影响.基于循环伏安法考察了丁卡因和普鲁卡因的电化学行为与发光机理.在优化的实验条件下,丁卡因和普鲁卡因的标准曲线分别在6.6 ~265.6 μmol/L和0.7 ~219.0 μmol/L范围内呈良好的线性,检出限(S/N=3)分别为1.9 μmol/L和0.2 μmol/L.对23 μmol/L丁卡因和15 μmol/L普鲁卡因的标准溶液连续测定5次,迁移时间的相对标准偏差(RSD)分别为0.13%、0.16%,电化学法发光强度的RSD分别为3.7%和4.9%.该方法已成功用于血浆中丁卡因和普鲁卡因的同时检测,平均回收率均为94%,相对标准偏差低于4%. 相似文献
7.
高锰酸钾—连二亚硫酸钠—核黄素化学发光体系的研究 总被引:3,自引:0,他引:3
在酸性溶液中,高锰酸钾能氧化核素产生化学发光,连二亚硫酸钠的存在可使发光强度大大增强,采用流动注射技术,建立了测定核黄素的化学发光分析法,方法的检出限为6.2×10^-8g/kmL,线性范围为2×10^-7~1×10^-5g/mL对4.0×10^-6g/mL核黄素进行11次平行测定,相对标准偏差为1.8%,方法用于针剂和片剂中核黄素测定,与药典标准方法-紫外分光光度法对照,相对误差不大于±2%。 相似文献
8.
9.
10.