An effective approach for size characterization and mass quantification of silica nanoparticles in coffee creamer by AF4-ICP-MS.

Silicon dioxide (SiO) has been used as a food additive (E551) for decades. However, some safety concerns have been raised recently due to the detection of silica nanoparticles (SiO NPs) in a variety of foodstuffs and their unknown long-term health risk to humans. In order for risk assessment to be conducted, it is essential to establish a reliable, valid, and pragmatic method for analysis of SiO NPs in foods for estimation of exposure.

Speciation and determination of inorganic arsenic in rice using liquid chromatography-inductively coupled plasma/ mass spectrometry: collaborative study.

An analytical method to speciate two inorganic As forms [arsenite, As(lll) and arsenate, As(V)] in indica and japonica types of rice (both husked and polished) and determine the inorganic As concentration as the sum of these two was internationally validated. The method can additionally determine two organic As compounds, monomethylarsonic acid and dimethylarsinic acid, in rice as separate LC peaks. The method is based on LC separation and inductively coupled plasma (ICP)-MS detection.