governmentchemist


Novel RMs produced to support WFD analyses by Nick Boley

Scientists at the European Commission’s Joint Research Laboratory (JRC), based in Geel (Belgium) have developed a series of three water reference materials (RMs) containing priority hazardous substances (PHS) as defined under the EU Water Framework Directive (WFD). These three novel materials contain:

  1. eight polycyclic aromatic hydrocarbons (PAHs),
  2. six polybrominated diphenyl ethers (PBDEs), and
  3. tributyltin

A recent report published under the Government Chemist’s Advisory Function on analytical measurement issues in relation to the WFD highlighted the dearth of reference materials to support laboratories carrying out monitoring of water bodies in support of the WFDs. These new materials provide an extremely welcome development to help and support monitoring laboratories in carrying out these measurements accurately and precisely at the very low concentrations required.



Characterisation report on Cerium dioxide nanomaterials produced by JRC by Nick Boley

The European Commission’s Joint Research Centre (JRC) has published a report detailing the characterisation of two cerium oxide nanomaterials, designated NM-211 and NM-212. These nanomaterials are described as “representative test materials”, so they are not reference materials, but do have a number of properties which enable them to be useful to laboratories wishing to compare their measurements for a range of physico-chemical parameters for nanomaterials. They are therefore of significant value to laboratories wishing the benchmark their measurements in this important field, particularly in advance of the EU definition of a nanoparticle being implemented within the next year.

The characterisation of the materials covered a wide range of properties including particle size. The measurements indicated that these materials exhibited a significant level of aggregation and agglomeration, but the material NM-212 did have a significant population of particles below 50 nm in diameter, with the mean diameter, as determined by Scanning Electron Microscopy (SEM) of 28.4 +/- 10.4 nm.

There was no result report about the number of particles (by mass or number) with one dimension below 100  nm,  so no conclusion could be made regarding whether these materials complied with the proposed EU definition of a nanoparticle.



LGC to develop new nanoparticle Reference Materials by Nick Boley
September 17, 2012, 09:04
Filed under: Nanomaterials, Reference materials, Uncategorized | Tags:

LGC, the UK’s designated National Measurement Institute for chemical and bioanalytical measurement, is developing a range of nanoparticle reference materials to enable the development of traceable methods for improved in vitro toxicity measurement for safety assessment.

These will be assessed for their physical and chemical properties in an in vitro biological matrix. These  materials will be based on the high quality nanoparticles produced by the EU-Joint Research Centre (JRC) which have undergone extensive physical characterization in the dry-powder form. LGC are carrying out the characterization work using a unique combination of Nanoparticle Tracking Analysis , with field flow fractionation coupled to inductively coupled plasma mass spectrometry (FFF-ICPMS), allowing complex suspensions of nanomaterials to be characterized for their size, size distribution, charge, concentration, dissolution and elemental composition.