Overview
This Vietnamese-language paper describes the development and characterization of a certified reference material for lead, cadmium, arsenic, and mercury in mustard greens (Brassica juncea) using a natural infection (contamination) method. The paper is primarily a metrological/analytical chemistry study describing how to prepare a stable reference material for use in laboratory QA/QC, rather than a food survey of metal occurrence.
Key numbers
Limited English-language data are extractable from the paper. From the abstract:
- Reference material concentrations for lead (Pb), cadmium (Cd), arsenic (As), mercury (Hg) in mustard greens were established from samples spiked with salts Pb(NO3)2, Cd(NO3)2.4H2O, NaAsO2, Hg2(NO3)2.2H2O at a concentration of 550 ppm (preparation level).
- The range of Pb, Cd, As, Hg content in certified reference samples is reported at page 11 in Vietnamese (1.48 µg/kg context present).
- The paper is primarily in Vietnamese; the full numerical values are in Vietnamese-language tables not machine-extractable to English.
Methods
Natural infection/spiking method; preparation of certified reference material; multiple analytical methods; assigned values with uncertainty (µg/kg).
Implications
This is a reference material development study, not a food occurrence survey. The spiking concentrations used (550 ppm) are laboratory preparation levels, not naturally occurring concentrations. The assigned reference values may be useful for laboratory method validation but do not represent market or field occurrence of Pb, Cd, As, Hg in mustard greens. This source is evidence-tier C because the full numerical data are in Vietnamese and the study design is metrological rather than occurrence-based.
Certification: not in HMT&C threshold pools. Routes as methodological context.
App: No contamination_profile blocks are touched.
Microbiome: Not a focus of this source.
Update history
No substantive edit history is available in this build. The full commit record is available in git.