So, I am working with hydride generation in my lab. To detect arsenic by micro plasma, I use a peristaltic pump which pumps acidic solution of As(III) and basic solution of NaBH4 into a reaction coil. From the reaction coil, the solution falls into a gas-liquid separator (GLS) which is supplied by a carrier gas. Carrier gas takes the arsine to micro plasma for detection.
The problem in this system is that reaction time is 4 seconds in the coil before the solution falls into GLS, but the signal for arsenic keeps on appearing for about one minute. I want to decrease the time domain of this signal. Please suggest any changes in my instrument to reduce this time domain of signal. I want all the arsine to be released from the solution at once.
perhaps the problem is the strength/type of your acid solution? If you are using a strong oxidising acid like nitric acid and concentration is high then this will consume the reductant (NaBH4) so that not enough reductant is available to reduce the As quickly. I have seen this problem in the past for mercury hydride systems.
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