This paper describes an effective method for determining chlordiazepoxide. An excess of sodium tetraphenylboron is added to precipitate chlordiazepoxide in HAc NaAc buffer solution (pH=4.0). After filtering off the p...This paper describes an effective method for determining chlordiazepoxide. An excess of sodium tetraphenylboron is added to precipitate chlordiazepoxide in HAc NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate is titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied for the determination of chlordiazepoxide raw materials with satisfactory results. The recovery is between 99.58% and 100.4%, the relative error is less than ± 0.50% . Experiments show that the method gives the same results as the approach using nonaqueous titration (ChP).展开更多
This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering...This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied to the determination of ciprofloxacin lactate raw material with satisfactory results. The recovery was between 99.66% and 100.2%, the relative error was less than ±0.40%. Experiments showed that the method gave the same results as the approach using nonaqueous titration (ChP).展开更多
The content of phenoxymethylpenicillin potassium in phenoxymethylpenicillin potassium tablet was determined indirectly with second order differential simple oscillographic voltammetry. The linear concentration range a...The content of phenoxymethylpenicillin potassium in phenoxymethylpenicillin potassium tablet was determined indirectly with second order differential simple oscillographic voltammetry. The linear concentration range and the detection limit is 2 6×10 -6 ～3 5×10 -5 mol/L and 1×10 -6 mol/L, respectively. The regressive equation is h(V) =1 169-1 129×10 4 c (mol/L), ( r =-0 999 8). The RSD of the determination for 1 8×10 -5 mol/L phenoxymethylpenicillin potassium is 3 2%, and the recovery is 102 2%( n =8). This method has the advantages of convenient, rapid and without special pretreatment of the sample.展开更多
文摘This paper describes an effective method for determining chlordiazepoxide. An excess of sodium tetraphenylboron is added to precipitate chlordiazepoxide in HAc NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate is titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied for the determination of chlordiazepoxide raw materials with satisfactory results. The recovery is between 99.58% and 100.4%, the relative error is less than ± 0.50% . Experiments show that the method gives the same results as the approach using nonaqueous titration (ChP).
文摘This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied to the determination of ciprofloxacin lactate raw material with satisfactory results. The recovery was between 99.66% and 100.2%, the relative error was less than ±0.40%. Experiments showed that the method gave the same results as the approach using nonaqueous titration (ChP).
文摘The content of phenoxymethylpenicillin potassium in phenoxymethylpenicillin potassium tablet was determined indirectly with second order differential simple oscillographic voltammetry. The linear concentration range and the detection limit is 2 6×10 -6 ～3 5×10 -5 mol/L and 1×10 -6 mol/L, respectively. The regressive equation is h(V) =1 169-1 129×10 4 c (mol/L), ( r =-0 999 8). The RSD of the determination for 1 8×10 -5 mol/L phenoxymethylpenicillin potassium is 3 2%, and the recovery is 102 2%( n =8). This method has the advantages of convenient, rapid and without special pretreatment of the sample.
