Chlorate $\left({{\mathrm{CIO}}^{-}}_3\right)$, chlorite $\left({{\mathrm{CIO}}^{-}}_2\right)$, bromate $\left({{\mathrm{BrO}}^{-}}_3\right)$, and iodate $\left({{\mathrm{IO}}^{-}}_3\right)$can be measured in drinking water at the 1-ppb level with 1% precision by selected reaction monitoring. Chlorate and chlorite arise from ${\mathrm{CIO}}_2$used as a disinfectant. Bromate and iodate can be formed from ${\mathrm{Br}}^{-}$or ${\mathrm{I}}^{-}$when water is disinfected with ozone $\left({\mathrm{O}}_3\right)$. For the highly selective measurement of chlorate, the negative ion selected by Q1 in Figure 22-33 is m/z 83 and the negative ion selected by Q3 is m/z 67. Explain how this measurement works and how it distinguishes ${\mathrm{CIO}}_3^{-}$from ${\mathrm{CIO}}_2^{-}$, ${\mathrm{BrO}}_3^{-}$, and${\mathrm{IO}}_3^{-}$

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