Pyrohydrolysis ICP-MS Halogen Detection Without Deflagration

The patent applies preliminary action by pre-heating the sample before combustion to gradually remove organic matter. The process involves heating at 300-600°C for 5-10 minutes, then at 700-800°C for 5-10 minutes, and finally at 1000-1100°C for 10-30 minutes. This staged pre-heating prevents sudden deflagration by slowly decomposing organic components before the main combustion phase, thereby maintaining both detection sensitivity and safety.

The patent merges pyrohydrolysis sample treatment with ICP-MS detection into an integrated system. The pyrohydrolysis module converts halogens into halogen acids that are absorbed into solution, which is then directly analyzed by ICP-MS. This combination achieves high detection sensitivity for multiple elements (Cl, Br, I) while maintaining operational simplicity through automated processing, resolving the trade-off between ease of operation and detection sensitivity.

The patent employs disposable quartz sand and asbestos materials in the pyrohydrolysis process. These inexpensive, single-use materials prevent contamination from reusable digestion vessels and eliminate the need for expensive microwave digestion equipment. The quartz sand and asbestos are discarded after one use, ensuring no interference elements are introduced while maintaining high detection speed and low operational cost.

The patent changes the fundamental parameter of sample treatment from chemical fusion (acid/alkaline) to thermal pyrohydrolysis. By controlling temperature parameters (300-1100°C in stages) and oxygen flow rates (50-200 mL/min), the method achieves complete sample treatment without requiring lengthy fusion processes. This parameter change reduces operation time from hours to minutes while minimizing environmental pollution through controlled combustion rather than large volumes of chemical reagents.