β Scribed by Huichang Ma; Jingfu Liu
No coin nor oath required. For personal study only.
A unstable intermediate product with peak absorbance at 494 nm was found in the reactlon of cyamde with pyrldme-barbltunc acid reagent The Intermediate was applied to the determination of cyanide by reagent-mqectlon flow-mqectlon analysis The cahbratlon graph was hnear over the range of O-4 pg ml-' cyanide and the detection hmlt was 20 ng ml-' cyanide, the relative standard deviation at 10 kg ml-' was 0 6% (n = 16) and the sampling rate was 60 h-' Interference studies showed that the main mterferents are Co*', N?, SCN-, I-and formaldehyde The proposed method was applied successfully to determme free cyanide m natural and waste water samples
π SIMILAR VOLUMES
A method to determine trace levels of cyanide in 3guanidinopropionic acid (3-GPA) was developed and validated. Instrumentally, a detection limit of less than 1 ppb (1 rig/g)) was achieved. However, because of variability in the blank, a routinely achievable detection limit of 5 ppb is quoted. In thi
A flow-injection system is proposed for the rapid determination of trace amounts of formaldehyde based on its inhibition of the Brilliant Green-suiphite reaction at pI1 7. Formaldehyde in the range 40-3000 ng ml-' can be determined at a rate of 35 f 5 samples h -I. The limit of detection was 20 ng m
The air oxidation of reduced nicotinamide adenine dinucleotide (NADH), catalyzed by peroxidase, provides a useful "indicator reaction" for the determination of both NADH and serum lactate dehydrogenase (LDH). Application of this indicator reaction for repetitive determinations by sample injection in