PACS-3: Marine Sediment Reference Material for Trace Metals and other Constituents

The following tables show those constituents for which certified, reference and information values have been established for this marine sediment certified reference material (CRM).

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. A coverage factor of two (2) was applied for all elements. It is intended that UCRM accounts for every aspect that reasonably contributes to the uncertainty of the measurement. All listed values are expressed on a dry mass basis.

Table 1

Table 1: Certified quantity values for trace metals in PACS‑3

Element Mass fraction,
mg/kg
antimony (a,c) 14.7 ± 2.2
arsenic (b,c) 30.3 ± 2.4
beryllium (b) 1.06 ± 0.12
cadmium (a) 2.23 ± 0.16
chromium (a,c) 90.6 ± 4.0
copper (a,c) 326 ± 10
lead (a,c) 188 ± 7.4
lithium (a,c) 31.9 ± 4.2
manganese (b,c) 432 ± 16
mercury (a) 2.98 ± 0.36
nickel (a,c) 39.5 ± 2.2
strontium (a,c) 267 ± 10
tin (a,c) 22.0 ± 2.2
vanadium (b,c) 129 ± 8
zinc (a,c) 376 ± 12

Table 1 (continued): Certified quantity values for butyltin compounds in PACS‑3

Substance Mass fraction,
mg/kg as Sn
monobutyltin (e,f) 1.47 ± 0.22
dibutyltin (e,f) 0.631 ± 0.038
tributyltin (e,f) 0.43 ± 0.06

Table 1 (continued): Certified quantity values for matrix constituents in PACS‑3

Element Mass fraction
g/(100 g) (%)
aluminum (c,d) 6.58 ± 0.12
calcium (c,d) 1.89 ± 0.12
iron (c,d) 4.106 ± 0.064
magnesium (c,d) 1.402 ± 0.058
phosphorus (c,d) 0.0937 ± 0.0044
potassium (c,d) 1.253 ± 0.040
silicon (d) 26.1 ± 3.4
sodium (c) 3.52 ± 0.34
sulfur (d) 1.17 ± 0.44
titanium (c,d) 0.442 ± 0.018

Table 2

Table 2: Reference values for PACS‑3

Element Mass fraction,
mg/kg
silver (a) 1.10 ± 0.08

Table 3: Information values for PACS‑3

Table 3: Information values for PACS‑3

Element Mass fraction,
mg/kg
cobalt (b) 12.1
molybdenum (a) 5.9
uranium (a) 2.6

Coding

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

  • a - Isotope dilution inductively-coupled plasma mass spectrometry (ID-ICP‑MS)
  • b - Standard addition inductively-coupled plasma mass spectrometry (ICP‑MS)
  • c - Standard addition inductively-coupled plasma atomic emission spectroscopy (ICP-AES)
  • d - Fusion X-ray fluorescence spectroscopy (XRF)
  • e - Isotope dilution gas chromatography ICP‑MS (ID-GC-ICP‑MS)
  • f - Isotope dilution gas chromatography mass spectrometry (ID-GC-MS)

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 and matrix constituents in marine sediments and materials with similar matrices. A minimum sample mass of 250 mg is recommended.

Uncertainty

Included in the overall combined uncertainty estimate (uc) are uncertainties in the batch characterization (uchar), uncertainties related to possible between-bottle variation (uhom) and uncertainties related to inconsistency between the various measurement methods (umethod). Expressed as standard uncertainties, these components are listed in Table 4.

Table 4

Table 4: Uncertainty Components for PACS‑3

Element uc,
mg/kg
uchar,
mg/kg
u­hom,
mg/kg
u­method,
mg/kg
antimony 1.1 1.0 0.4 0.0
arsenic 1.2 1.0 0.6 0.0
beryllium 0.06 0.04 0.05 0.00
cadmium 0.08 0.07 0.03 0.00
chromium 2.0 1.4 1.4 0.0
copper 5 4 3 0
lead 3.7 2.3 2.9 0.0
lithium 2.1 0.6 0.7 1.9
manganese 8 5 1 6
mercury 0.18 0.16 0.09 0.00
nickel 1.1 0.8 0.8 0.0
strontium 5 2 4 3
tin 1.1 1.0 0.5 0.0
vanadium 4 4 1 0
zinc 6 5 4 0

Table (continued): Uncertainty Components for PACS‑3

Substance uc,
mg/kg
uchar,
mg/kg
u­hom,
mg/kg
u­method,
mg/kg
monobutyltin 0.11 0.04 0.10 0.00
dibutyltin 0.019 0.014 0.013 0.000
tributyltin 0.03 0.02 0.02 0.00

Table 4 (continued): Uncertainty Components for PACS‑3

Substance uc,
g/(100 g)
uchar,
g/(100 g)
u­hom,
g/(100 g)
u­method,
g/(100 g)
aluminium 0.06 0.05 0.03 0.00
calcium 0.06 0.06 0.01 0.00
iron 0.032 0.018 0.027 0.000
magnesium 0.029 0.028 0.008 0.000
phosphorus 0.0022 0.0022 0.0003 0.0000
potassium 0.020 0.010 0.008 0.016
silicon 1.7 1.7 0.1 0.0
sodium 0.17 0.17 0.04 0.00
sulfur 0.22 0.22 0.01 0.00
titanium 0.009 0.009 0.003 0.000

Table 4 (continued): Uncertainty Components for PACS‑3

Substance uc,
mg/kg
uchar,
mg/kg
u­hom,
mg/kg
u­method,
mg/kg
silver 0.04 0.01 0.04 0.00

Date of issue: October 2013
Date of expiry: October 2023
Revised: April 2015, March 2016 (editorial update), May 2018 (date of expiry extended)

Date modified: