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In our opinion, the article “Occupational exposure of midwives to nitrous oxide on delivery suites”1 is in need of some remarks.
In the paper a serious problem seems to be the presence of nitrous oxide in samples collected at the beginning of the shift.
Many years ago, when N2O in urine was first evaluated, we frequently observed “uncommon” concentration of N2O in urine of exposed and unexposed subjects. The phenomenon was kept under control and disappeared when urine samples were treated with a small quantity of H2SO4 (0.2 ml). For this reason, we …