REDS-1: Hard Red Spring Wheat Flour Reference Material for Trace Metals and other Constituents

REDS‑1 is a Reference Material prepared from enriched hard red spring wheat flour. Reference and information quantity values are provided in the following tables for trace metals and other constituents. Reference values are equally weighted means of results from at least two analytical methods and/or laboratories. Uncertainties are expressed as a 95% confidence interval. All values are expressed on a dry-mass basis.

Table 1: Reference values for REDS‑1

Element Mass fraction, mg/kg
Calcium 143 ± 16
Iron 31 ± 6
Magnesium 365 ± 30
Manganese 4.50 ± 0.44
Phosphorus 1370 ± 70
Potassium 1150 ± 120
Sulfur 1830 ± 24
Zinc 10.6 ± 1.4

Table 2: Information values for REDS‑1

Element Mass fraction, mg/kg
Aluminium 2.1
Barium 0.4
Boron 0.2
Cadmium 0.02
Chlorine 500
Chromium 0.026
Copper 2.0
Fluorine 0.02
Molybdenum 0.55
Nickel 0.2
Sodium 7
Nitrogen 26 900
Strontium 4
Tungsten 0.01
Vanadium 0.02

Intended use

This Reference Material (RM) is intended for use in evaluating analytical methods and instruments used for the determination of major, minor, and trace constituent elements in flour and other similar food, agricultural, and biological materials. A minimum sample mass of 500 mg is recommended.

This material is intended for laboratory use, not for human consumption.


Original uncertainty estimates for RM 8437 were verified at NRC and were retained in this report. As stated in the RM 8437 report [1], uncertainties are imprecision estimates expressed as a 95% confidence interval, based on a sample mass of at least 500 mg. These uncertainties, based on between-method and between-laboratory, between-unit and within-unit estimates of variances, include measures of analytical method and laboratory imprecisions and biases and material inhomogeneity.

Date of Issue: September 2015
Date of Expiry: September 2025
Revised: March 2016 (editorial update)

Date modified: