Major nutrients in a NFT spinach hydroponic solution, cations (K
+, Ca
2+, Mg
2+, Na
+) and anions (NO
3−, SO
42−, H
2PO
4−), were analyzed by CE with capacitively coupled contactless conductivity detection (C
4D). C
4D was fitted on a fused silica capillary (i.d., 50 μM; o.d., 375 μM; total length, 60 cm) at the position of 45 cm from an inlet. Electrophoresis buffers were 12 mol L
−3 histidine - 117 mol L
−3 acetic acid (pH 3.7) (cation analysis), and 10 mol L
−3 histidine - 50 mol L
−3 malic acid (pH 3.0) (anion analysis). All peaks were completely separated and linear calibration ranges were between 20 mol L
−6 and 500 mol L
−6 (K
+), 20 mol L
−6 and 1000 mol L
−6 (NH
4+, Ca
2+, Na
+, Mg
2+), 100 mol L
−6 and 1000 mol L
−6 (anions). The obtained results were verified using ICP-OES and ion chromatography. As an actual application, the major nutrients of the NFT hydroponic solution of spinach cultivation were successfully measured.
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