10.
The chemical effects of self-sustained spark discharge with an energy per pulse of 5.9 × 10
−2 J, a pulse repetition frequency of 10 Hz, and a spark-gap breakdown voltage of 6 kV have been studied. The discharge generated a UV photon flux of (2.5 ± 0.3) × 10
15 cm
−2 s
−1 with an energy density of (2 ± 0.3) × 10
−3 J cm
−1 s
−1 and the emission spectrum maximum at 220 nm. The action of the discharge on water samples leads to a decrease in pH and to buildup of oxidizing and reducing species. The formation of HO
2· radicals with an initial yield of (1.2 ± 0.3) × 10
−6 mol L
−1 s
−1 has been detected in the liquid. The initial yields of acid residues (increment in [H
+]), oxidants, and reducing agents are (5.8 ± 1.6) × 10
−7, (3.3 ± 1) × 10
−6, and (4.2 ± 1) × 10
−7 mol equiv L
−1s
−1, respectively. The formation of NO
3− and NO
4+ ions, nitrosamines, and organic compounds has been established.
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