Itemu elivamile lezinqubo zomjovo ezisebenzisa izixazululo zamakhemikhali ezikhethekile ukuze kuthuthukiswe ukutholwa kukawoyela, ukususa ukubola kokwakheka, ukuhlanza imibhobho evinjiwe noma izendlalelo zokwakheka, ukunciphisa noma ukuvimbela ukugqwala, ukuthuthukisa uwoyela ongahluziwe, noma ukubhekana nezinkinga zokuqinisekisa ukugeleza kukawoyela ongahluziwe.Umjovo ungafakwa ngokuqhubekayo, ngamaqoqo, emithonjeni yomjovo, noma ngezinye izikhathi emithonjeni yokukhiqiza.