N item

Type of reference material

Kind of reference material

Property

Range

Expanded uncertainty
(k = 2, P = 0,95) (error)

Approach used to assign property value

1

2

3

4

5

6

7

INORGANIC REFERENCE MATERIALS (А2)

1

Aqueous solutions of single-component cations

(А2.6.1)

Glass ampoules

Plastic screw cap tubes

Ion mass concentration

(0,0475 – 10,5) g/dm³

(0,25 – 1) % (relative)

Measurement by primaries methods in a single laboratory: constant-potential coulometry, coulometric titration, gravimetry.

Measurement by secondary methods according to certified measurement procedures and using CRM, certified by primaries methods: titrimetry, AC conductometry

2

Aqueous solutions of single-component anions

(А2.6.2)

Glass ampoules

Plastic screw cap tubes

Ion mass [molar] concentration

(0,095 – 10,5) g/dm³

[ (0,97 – 1,03) mol/dm³]

(0,25 – 2) % (relative)

[0,5 % (relative)]

Measurement by primaries methods in a single laboratory: coulometric titration, gravimetry.

Measurement by secondary methods according to certified measurement procedures and using CRM, certified by primaries methods: titrimetry, AC conductometry, spectrophotometry

3

Multi-component aqueous solutions of metals

(А2.6.3)

Glass ampoules

Plastic screw cap tubes

Mass concentration of metal ion

(0,095 – 0,525) g/dm³

2 % (relative)

Measurement by secondary methods according to certified measurement procedures and using CRM, certified by primary method: ICP spectrometry

ORGANIC REFERENCE MATERIALS (А3)

4

Pure chemical substances

(А3.1.1)

Glass ampoules

Molar fraction of basic substance

(99,30 – 99,98) %

(0,04 – 0,14) % (absolute)

Measurement by primaries methods in a single laboratory: cryometry

5

Solutions of organic substances in organic solvents

(А3.1.2)

Glass ampoules

Mass concentration of organic compound

(0,095 – 52,5) g/dm³

(2,0 – 4,0) % (relative)

Measurement by secondary methods according to certified measurement procedures and using CRM, certified by primary method: gas chromatography

REFERENCE MATERIALS for environmental analysis (А4)

6

Properties of aqueous media

(А4.3.1)

Glass ampoules

Plastic screw cap tubes

Turbidity

(3800 – 4200) FTU

(formazine turbidity units)

2,0 % (relative)

Measurement by secondary methods using high precision measuring instruments and working standards: spectrophotometry

Colour

(475 – 525) degrees of colour

1,5 % (relative)

Total hardness

(9,5 – 105) degrees of hardness

1,5 % (relative)

Measurement by secondary methods according to certified measurement procedures and using CRM, certified by primary method: titrimetry

COD (dichromate oxidation of water)

(9500 – 10500) mg/dm³

1,5 % (relative)

Total alkalinity

(950 – 1050)  mmol/dm³

1 % (relative)

TDS
(Total dissolved solids)

(47500 – 52500) mg/dm³

1 % (relative)

Measurement by primaries methods in a single laboratory: gravimetry

ION ACTIVITY (А9)

7

рН standards (А9.1)

Plastic containers

рН

(1,65 - 9,18) pH

0,01 рН

Measurement by secondary method using high precision measuring instruments and working standards: potentiometry

8

Electrical conductivity standards

(А9.3)

Glass ampoules

Specific electrical conductivity

(0,0045 – 11,8) Sm/m

0,25 % (relative)

Measurement by secondary method using high precision measuring instruments and working standards: AC conductometry

N item

Type of reference material

Kind of reference material

Property

Range

Approach used to characterize

1

2

3

4

5

6

ORGANIC REFERENCE MATERIALS (А3)

9

Standards for chromatography (А3.1.3)

Glass ampoules

Molar fraction of basic substance

(99,30 – 99,99) %

Measurement by secondary method: gas chromatography

REFERENCE MATERIALS for environmental analysis (А4)

10

Organic pollutants

(А4.3.2)

Glass vials

Mass of oils

(6,5 – 0,015) mg

Measurement by primaries methods in a single laboratory: gravimetry