2024 Volume 53 Issue 4 Pages 206-214
We improved the trigger reagent and flow of an automated acid decomposition device with continuous flow analysis to reduce its cost and stabilize the measurements. For a trigger reagent, we investigated a Pd reagent, which is more readily available than an Rh reagent, and found it could be a good trigger reagent. Next, we moved the position of debubbling after thermal decomposition from 1m away from the outlet of the heating tank to 10 ㎝ away, and bubble disturbances caused by solids precipitated by cooling were no longer observed. We also developed a dual flow branching from the spectrophotometric detector to the ICP-MS inlet for improving the stability of absorbance signal and reducing nebulizer clogging. In simultaneous metal analysis of actual samples using the improved device, good results were obtained in standard solution measurements and spike-and-recovery tests. The findings may be useful for developing automatic pretreatment devices.
