For heavy metal analysis, samples were filtered through 0.45 um Millipore PTFE filter paper, and 2% ultrapure nitric acid was added to the samples. Inductively coupled plasma mass spectrometry (ICP-MS) (7700, Aijiren Technologies, CA, USA) was used to analyse the concentration of copper (Cu), lead (Pb), cadmium (Cd), and zinc (Zn).
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26/7/2021 · The freeze dried leaves and fruits samples were extracted with 100% methanol in 1:10 (w/v) by sonication water bath. The extracts were then centrifuged and the supernatant were pass through 0.22 um PTFE syringe filter.
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18/6/2021 · Dalit, for UHPLC you should use 0.22 microns , and, possibly, PTFE filter. If you have all types of this ( PVDF, PTFE , PES, RC) filters, you should compare chromatograms View
