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two standard buffer solutions with ph values at 20 °c which are known to the second decimal place and will bracket the ph value of the sample under test, for example phtalate buffer solution of ph approximately 4 and a borax buffer solution of ph approximately 9.
kaks standardpuhverlahust, mille ph-d temperatuuril 20 °c on teada kahe komakoha täpsusega ja ümbritsevad uuritava proovi ph-d ph skaalal mõlemalt poolt, näiteks ftalaatpuhvrilahus ph-ga umbes 4 ja boorakspuhvrilahus ph-ga umbes 9.
boric acid, borax, sodium sulphite anhydrous (e221) (see the package leaflet for further information), tyloxapol, povidone, disodium edetate, benzalkonium chloride (see the package leaflet for further information), water for injections, sodium hydroxide (for ph adjustment)
boorhape, booraks, veevaba naatriumsulfit (e221) (lisainfot vt pakendi infolehelt), tüloksapool, povidoon, dinaatriumedetaat, bensalkooniumkloriid (lisainfot vt pakendi infolehelt), süstevesi, natriumhüdroksiid (ph korrigeerimiseks)