Metrological support of phthalate content measurements: reference material for the composition of a solution of six priority phthalates in methanol

The article provides information on the development of a new reference material (RM) for composition solution six priority phthalates (dimethyl phthalate, diethyl di(n-butyl) benzyl butyl bis(2-ethylhexyl) di(n-octyl) phthalate) in methanol provided with metrological traceability to GET 208-2019 (GET 208). procedure preparation and certification RMs is shown, including estimation homogeneity stability. Pure organic substances (phthalates) characterized 208 were used as starting RM. RM was prepared by weight volume-weight methods. stability study carried out isochronous procedure. certified values are mass fraction concentration individual solution. When calculating uncertainty budget values, contributions from purity materials, procedures, heterogeneity, long-term instability taken into account. relative expanded does not exceed 2 %. As result, (CRM) developed approvedfor ortho-phthalic acid esters GSO 11366-2019. practical significance application 11366-2019 ensure corresponding SI units reproduced 208. CRM can be applied resolving any measuring tasks performing full range works.