GB/T 23942-2009Chemical reagent - General rules for inductively coupled plasma atomic emission spectrometry (English PDF)

3.1 High frequency generator

A high frequency power source that provides high frequency energy to the coupling coil and plasma.

3.2 Plasma torch

A device consisting of three layers of concentric quartz tubes to maintain a stable discharge of inductively coupled plasma (ICP).

3.3 Incident power

The net power delivered by the high frequency generator to the coupling coil and the plasma.

3.4 Observation height

Select the height of the exposed part of the plasma torch.

3.5 Coolant gas

The outermost gas flow of the torch which serves to cool the torch and maintain the plasma.

6.1 General requirements

The inductively coupled plasma atomic emission spectrometer shall comply with the provisions of JJG 768.

6.2 Instrument type

6.2.1 Multichannel inductively coupled plasma atomic emission spectrometer

6.3 Instrument composition

The inductively coupled plasma atomic emission spectrometer consists of an injection system, an excitation light source, a dispersion system, a detection system, and a data processing system.

7.1 Selection of measurement conditions

7.1.1 Analytical spectral lines of the elements under test

The wavelength of the analytical line of the element under test is given in Appendix C.

7.1.4 Gas and flow

In accordance with the torch and analysis requirements, DETERMINE the gas flow. The argon used shall meet the requirements of GB/T 4842.

7.1.5 Solution extraction rate

The extraction rate of the solution is generally (0.5 ~ 2) mL/min.

7.1.6 Analysis time

The rinse time and exposure time are determined by the instrument and analysis requirements.

7.2 Elimination of interference

7.2.1 The use of appropriate separation methods and selection of appropriate

element spectral lines, observation heights, incident power, and carrier gas flow may limit some of the interference effects in the light source to a certain level.

7.3 Measurement methods

7.3.1 Processing of samples

In accordance with the characteristics of the sample and the measurement characteristics of the instrument, the sample matrix may be removed by a separation method such as volatilization, acid digestion, alkali digestion, dry ashing, extraction, ion exchange, precipitation, or directly diluted to prepare a sample solution.

7.3.3 Standard addition method

PREPARE test solutions and blank solutions as specified in product standards.

MEASURE the same volume of the above test solution, at least four sets. DO not add standard solution in one set, ADD standard solution in proportions respectively into the rest sets, DILUTE it to the specified volume.

7.3.4 Calculation

The mass fraction of the elements to be measured is calculated by w, expressed in terms of "%" and calculated in accordance with formula (1).

9.3 Pay attention to safe electricity

A.1 Quartz sub-boiling distillation device

SEE Figure A.1.

A.2 Precautions

A.2.1 The temperature shall be strictly controlled below the boiling point of the acid and the solution must not boil.

A.2.2 Distilled liquid flow rate shall be controlled at about 40 mL/h. […]