A　novel　1,2-cyclohexylenedinitrilotetraacetic　acid　(CDTA)　modified　Fe3O4　magnetic　nanoparticles　(MNPs)　was　synthesized　by　one-step　solvothermal　method　and　used　as　solid　phase　extraction　(SPE)　material　to　preconcentrate　trace　copper　coupled　with　flame　atomic　absorption　spectrometry　(FAAS).　The　synthesized　adsorbents　were　characterized　by　field　emission　scanning　electron　microscopy　and　X-ray　powder　diffraction　with　a　nanoscale.　The　optimum　conditions　for　the　absorption　process　were　investigated　on　several　commonly　tested　experimental　parameters　such　as　pH　of　the　solution,　ultrasound　time,　sample　volume,　concentration　and　volume　of　elution　solution.　The　influences　of　some　anions　and　cations　on　the　recoveries　of　Cu(II)　ions　were　also　investigated,　and　no　considerable　interference　was　observed.　The　maximum　adsorption　capacity　of　Fe3O4　magnetic　nanoparticles　and　CDTA　modified　Fe3O4　magnetic　nanoparticles　were　found　to　be　27.50　mg/g　and　78.24　mg/g　for　Cu(II).　The　developed　method　was　applied　to　the　determination　of　Cu(II)　in　tap　and　lake　water　samples　with　recoveries　ranging　from　96.4%　to　99.1%.　(C)　2015　Elsevier　B.V.　All　rights　reserved.