A Solid Phase Extraction Application of Hybrid Nano B
2
O
3
/ZrO
2
for Separation and Determination of Trace Indium in Environmental Samples
Ozcan Yalcinkaya
1
, Harun Ciftci
2,
*
, Cigdem Er Caliskan
3
, Ozge Kalender
4
, Ali Rehber Turker
1