Development of a coffee bean certified reference material (KRISS CRM 108-10-023) for elemental analysis

Evaluation of the Possible Effect of the Grinders Installed in Fully Automatic Espresso Coffee Machines on the Element Content in Brewed Coffees

“…The contents of all the elements analyzed appear to be included in the lowest area of the ranges reported in the literature for roasted coffee beans. ,,,− This is surely a favorable aspect for the purpose of this investigation, since the element amounts eventually released by the grinders will be more easily detectable because the “background noise” (which is due in this case the element amounts naturally present in coffee beans) is quite low. In this regard, it must be remembered that these ranges largely depend on the coffee variety, its origin region, and the environmental and cultivation conditions of the relevant growing soils.…”

“…The reliability (in terms of accuracy, truthfulness, and precision) of the results acquired by our ICP-MS measurements was not evaluated using a certified standard reference material (CRM), i.e., a matrix having the characteristics of a real sample with certified values obtained using metrologically valid procedures, accompanied by metrological traceability and the related uncertainty . This is because a CRM matrix for coffee beverages (as well as for coffee powders and spent coffee pucks) is currently not yet available, although it is under attention and development since some CRM materials were recently proposed, , although these appear to be reliable only for some elements. The validation of our ICP-MS measurements was performed instead using working calibration solutions for all of the investigated elements.…”