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Continue to ChatVortexing/shaking-free solid phase extraction of lead(II) by using an urchin-like NiCo2O4 hollow microsphere adsorbent - https://avesis.erciyes.edu.tr/yayin/0cbd5209-13eb-483d-a667-5907f7c89d66/vortexing-shaking-free-solid-phase-extraction-of-leadii-by-using-an-urchin-like-nico2o4-hollow-microsphere-adsorbent