Determination of cadmium, lead and chromium in automotive plastic parts by ICP-2060T

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1. Instrument introduction

Inductively coupled plasma atomic emission spectrometer plasma temperature reachable

6000~8000K

When the sample is introduced into the atomizer by the injector and brought into the flame by the argon carrier gas, the components in the sample are atomized, ionized, excited, and emit energy in the form of light. The atoms of different elements emit characteristic spectra of different wavelengths when excited or ionized, so qualitative analysis can be performed according to the wavelength of the characteristic light; when the content of the elements is different, the intensity of the emitted characteristic light is also different, and thus quantitative analysis can be performed.

ICP-2060T

Inductively coupled plasma single-pass scanning emission spectrometer with excellent resolution, test accuracy and precision, widely used in rare earth industry, petrochemical, ore analysis, metal smelting, geological research, drug safety, experimental research, environmental testing, Food safety and other industries.

ICP-2060T

Inductively coupled plasma atomic emission spectrometry can be used to detect heavy metals (cadmium, lead, chromium, mercury) and other trace metals (such as copper, iron, calcium, etc.) in automotive products.

Figure

.ICP2060T

Inductively coupled plasma atomic emission spectrometer

2. ICP-2060T

Determination of cadmium, lead and chromium in automotive plastic parts

(1) Main instruments and reagents

ICP-2060T

Inductively coupled plasma optical emission spectrometer;

Microwave digestion instrument;

Nitric acid, hydrogen peroxide, sulfuric acid;

EC681K

Plastic standard sample;

Pb

, Cr, Cd standard solution

(

1000mg/l

).

(2)

Sample pretreatment (microwave digestion)

Weigh about 0.5000g (accurate to 0.0001g) sample in the microwave digestion tank, add 6ml nitric acid, 2ml hydrogen peroxide, heat on the hot plate at 160 °C for 30min, then take off and cool, then install the explosion-proof pad after cooling, install The canister was placed in a microwave digestion apparatus to run the digestion sample with the set parameters of Table 7.

Table 7 Microwave digestion parameters

Temperature (°C)

Power (W)

Duration (min)

100

600

10

120

600

10

140

600

10

160

600

10

After the end of the program operation, take out after cooling is completed, filter to a volume of 50 ml to be tested, and perform parallel sample and sample blank test.

(3)

Sample determination

The inductively coupled plasma optical emission spectrometer was used to directly absorb the standard solution and the sample solution for measurement, and the responsiveness of cadmium, lead and chromium were obtained, and the concentrations of cadmium, lead and chromium in the sample were calculated. The operating conditions of the inductively coupled plasma optical emission spectrometer are shown in Table 8:

Table 8 Instrument operating parameters

element

Wavelength (nm)

Peak traversing step nm

Negative high voltage V

Integration method

lead

220.353

0.002

800

Peak height

chromium

267.716

0.002

600

Peak height

cadmium

228.812

0.002

800

Peak height

(4)

Test Results

table

9

Plastic standard sample

EC681K

The test results of cadmium, lead and chromium elements show that the ICP-2060T has high accuracy in the determination of cadmium, lead and chromium in plastic samples.

table

9.

Cadmium, lead, chromium element test results

element

Pb

Cr

Cd

Standard value (mg/kg)

98

60

137

Test result (mg/kg)

104.3

58.6

129.0

Accuracy

106.4%

97.7%

94.2%