A portable spectrophotometer developed by Changchun R & D Center for Analytical Instruments, which combines ΔI measurement mode and a measurement mode together with a high sensitivity, good accuracy and low cost,...A portable spectrophotometer developed by Changchun R & D Center for Analytical Instruments, which combines ΔI measurement mode and a measurement mode together with a high sensitivity, good accuracy and low cost, is employed to replace the traditional spectrophotometer and the sensitivity is enhanced. Therefore, a new rapid method with low cost and simplicity in operation for protein determination is developed. For this method, the linear range is shown to be 0—0 74 μg/mL, the detection limit is 0 01 μg/mL, and the analysis can be completed within 5 min. The albumin in urine is determined and all the results are confirmed by the standard method. Because of the rapid analysis speed, less expenditure, more convenience and simplicity in operation of this method, it is possible to use this method to diagnose glycosuric nephropathy at an early stage, even do it at home.展开更多
The indigo carmine was reduced by using cheap,easily attainable and non poisonous reagents. Therefore, a special reagent was developed to measure the concentration of dissolved oxygen in water in situ . The molar abso...The indigo carmine was reduced by using cheap,easily attainable and non poisonous reagents. Therefore, a special reagent was developed to measure the concentration of dissolved oxygen in water in situ . The molar absorption coefficient of the method is 1 35×10 4, and its dynamic linear range is 0-27 mg/L linearity coefficient of 0 997. The most oxidizing species, such as Cl 2, ClO -, Cu 2+ , Fe 3+ , V 5+ , and As(Ⅴ), do not interfere the determination. It takes no more than 1 min to analyze one sample. The method was applied to determining some practical samples and all the results obtained were satisfactory.展开更多
文摘A portable spectrophotometer developed by Changchun R & D Center for Analytical Instruments, which combines ΔI measurement mode and a measurement mode together with a high sensitivity, good accuracy and low cost, is employed to replace the traditional spectrophotometer and the sensitivity is enhanced. Therefore, a new rapid method with low cost and simplicity in operation for protein determination is developed. For this method, the linear range is shown to be 0—0 74 μg/mL, the detection limit is 0 01 μg/mL, and the analysis can be completed within 5 min. The albumin in urine is determined and all the results are confirmed by the standard method. Because of the rapid analysis speed, less expenditure, more convenience and simplicity in operation of this method, it is possible to use this method to diagnose glycosuric nephropathy at an early stage, even do it at home.
文摘The indigo carmine was reduced by using cheap,easily attainable and non poisonous reagents. Therefore, a special reagent was developed to measure the concentration of dissolved oxygen in water in situ . The molar absorption coefficient of the method is 1 35×10 4, and its dynamic linear range is 0-27 mg/L linearity coefficient of 0 997. The most oxidizing species, such as Cl 2, ClO -, Cu 2+ , Fe 3+ , V 5+ , and As(Ⅴ), do not interfere the determination. It takes no more than 1 min to analyze one sample. The method was applied to determining some practical samples and all the results obtained were satisfactory.
