Analytes

Method

Code

Determination lower limit, mg/kg

Ca²⁺

Volumetry

Titr -91

0.5

Mg²⁺

Volumetry

Titr -92

0.5

Na⁺

АES

АES -99

0.05

K⁺

АES

АES -100

0.05

Cl^-

Volumetry

Titr -77*

5.0

SO₄^2-

Gravimetry

Grav -101

20.0

CO₃^2-

Volumetry

Titr -93

1.0

HCO₃^-

Volumetry

Titr -94

1.0

NO₃^-

Spectrophotometry

SPhM -95

0.05

NO₂^-

Spectrophotometry

SPhM -96

0.05

NH₄⁺

Spectrophotometry

SPhM -97

0.05

F^-

Spectrophotometry

SPhM -107

0.05

H₂SiO₃

Spectrophotometry

SPhM -98

0.05

pH

pH-meter

WA-102

0.1

Conductivity

Conductivity meter

WA-104

1.0

Total dissolved solids

Gravimetry

Grav -103

0.1

Hardness

Calculation

0.5

Chemical oxygen demand

Volumetry

0.1

Elements

Method

Code

Determination lower limit, mg/l

Al

Inductively coupled plasma optical emission spectrometry (ICP-OES)

ICP-25*

0.025

Fe

0.02

Cu

0.01

Zn

0.01

Pb

0.05

Ni

0.03

Co

0.01

Mn

0.01

Cr

0.02

V

0.01

Mo

0.03

Ag

0.05

Sb

0.05

Cd

0.05

Sr

0.01

Ba

0.01

As

0.01

U

Spectrophotometry

SPhM-76*

0.01