TORT-3: Lobster Hepatopancreas Reference Material for Trace Metals

The following table shows those elements for which certified values have been established for this reference material. Certified values are based on results from data generated at NRC. The expanded uncertainty (UCRM) in the certified value is equal to U = kuc where uc is the combined standard uncertainty calculated according to the JCGM Guide and k is the coverage factor. It is intended that UCRM accounts for every aspect that reasonably contributes to the uncertainty of the measurement. A coverage factor of 2 was applied for all elements. The table below lists certified values for TORT‑3 expressed on a dry mass basis.

Table 1: Certified Quantity Values

Element Mass fraction, (mg/kg)
Arsenic (d,i) 59.5 ± 3.8
Cadmium (i,p) 42.3 ± 1.8
Chromium (i,p) 1.95 ± 0.24
Cobalt (d) (1.06)Footnote 1
Copper (d,i,p) 497 ± 22
Iron (d,i) 179 ± 8
Lead (d,p) 0.225 ± 0.018
Manganese (d,p) 15.6 ± 1.0
Mercury (p) 0.292 ± 0.022
Molybdenum (d,p) 3.44 ± 0.12
Nickel (d,p) 5.30 ± 0.24
Selenium (d,p) 10.9 ± 1.0
Strontium (i,p) 36.5 ± 1.6
Tin (d,p) (0.029)Footnote 1
Vanadium (d,p) 9.1 ± 0.4
Zinc (i,p) 136 ± 6
Arsenobetaine (as As)(o,t) 54.9 ± 2.5
Methylmercury (as Hg)(q,s) 0.137 ± 0.012

Footnotes

Footnote 1

an information value is listed due to insufficient information to accurately assess uncertainties..

Return to footnote 1 referrer

Coding

The coding refers only to the instrumental method of analyte determination.

  • d - inductively coupled plasma mass spectrometry
  • i - inductively coupled plasma atomic emission spectrometry
  • o - isotope dilution liquid chromatography orbitrap mass spectrometry
  • p - isotope dilution inductively coupled plasma mass spectrometry
  • q - gas chromatography inductively coupled plasma mass spectrometry
  • s - gas chromatography mass spectrometry
  • t - liquid chromatography inductively coupled plasma mass spectrometry

Intended use

This reference material is primarily intended for use in the calibration of procedures and the development of methods for the determination of trace metals in marine fauna and materials of similar matrix.

Uncertainty

Included in the overall uncertainty estimate (uc) are uncertainties in the batch characterization (uchar) and uncertainties related to possible between-bottle variation (uhom). Expressed as standard uncertainties these components are listed in Table 2.

Table 2: Uncertainty components

Element uc,
mg/kg
uchar,
mg/kg
uhom,
mg/kg
As 1.9 1.7 0.8
Cd 0.9 0.5 0.8
Cr 0.12 0.06 0.10
Cu 11 9 6
Fe 4 4 3
Pb 0.009 0.004 0.009
Mn 0.5 0.5 0.2
Hg 0.011 0.005 0.010
Mo 0.06 0.04 0.05
Ni 0.12 0.10 0.06
Se 0.5 0.4 0.3
Sr 0.8 0.6 0.5
V 0.2 0.2 0.2
Zn 3 2 2
MeHg(Hg) 0.006 0.004 0.005
AsBet(As) 1.23 0.96 0.77

Date of issue: April 2013
Date of expiry: April 2023
Revised: March 2016 (editorial update)

Date modified: