2results about How to "Reduce memory effect" patented technology

The application discloses a precision detection method for volatile heavy metal elements in metallurgical residual activated sludge, and belongs to the technical field of environmental monitoring and chemical analysis. The application optimizes a "HNO3-H2O2-HF" composite acid system combined with gradient temperature microwave digestion, can effectively destroy the complex mineral lattice of metallurgical sludge, release the wrapped heavy metals, ensure that the extraction rate is greater than 95%, and the result is closer to the true value. The addition of L-cysteine complex significantly improves the element stability, improves the atomization stability in ICP-MS, and reduces the memory effect. The microwave digestion is selected, the sample is subjected to in a closed system, the acid consumption is small, the waste gas emission is small, the use and exposure risk of HF are reduced. Subsequent low-temperature driving of hydrofluoric acid effectively reduces the volatilization of trace elements, and L-cysteine is used to protect the volatile elements, and the stability in the subsequent transfer, storage and detection process.

This invention belongs to the field of mass spectrometry technology, specifically providing a multi-mode mass spectrometer, including an ion source with a first inlet, an ion funnel including multiple electrodes, multiple isolators and a heating element, wherein the isolators are disposed between adjacent electrodes of the ion funnel and are insulated from adjacent electrodes, and the heating element is disposed on the isolators; a second inlet is disposed between the ion source and the ion funnel. This invention has advantages such as strong detection capability, strong anti-contamination capability, and high ion transmission efficiency.