Neonicotinoids neonicotinoid 3 Chromatography, Liquid 2 Guanidines 2 Humans 2 Insecticides 2 LC-MS/MS 2 Pesticide Residues 2 Risk Assessment 2 Spinacia oleracea 2 Tandem Mass Spectrometry 2 Thiamethoxam 2 Thiazoles 2 acute dietary risk assessment 2 clothianidin 2 dissipation behavior 2 guanidine derivative 2 human 2 liquid chromatography 2 metabolism 2 pesticide residue 2 procedures 2 risk assessment 2 spinach 2 tandem mass spectrometry 2 thiamethoxam 2 thiazole derivative 2 5-hydroxy-imidacloprid 1 Acetamiprid 1 Acetone 1