Anwendungen

Determination of Lead in Aluminum Alloys – Flame Atomic Absorption Spectrometry

Juli 28, 2025

1. Method Overview

Wet digestion: Dissolve the sample with hydrochloric acid, nitric acid, and hydrogen peroxide. Determine lead at a wavelength of 283.3 nm using an air-acetylene neutral flame.

2. Instruments and Reagents

2.1 Instruments and Equipment

2.1.1 Testing Instruments

Serial No.	Name	Menge	Technical Requirements	Zubehör
1	Flame atomic absorption spectrophotometer	1 set		Lead hollow cathode lamp
2	Acetylene	1 cylinder	Purity ≥ 99.99%
3	Air compressor

2.1.2 Pretreatment Equipment

Serial No.	Name	Menge	Technical Requirements
1	Temperature-controlled electric hot plate	1 set	Rated temperature: room temperature ~ 300℃
2	Electronic balance	1 set	Sensitivity: 0.1 mg
3	Ultrapure water system	1 set
4	Micropipette	1 each	20 μL ~ 200 μL; 100 μL ~ 1000 μL
5	Volumetric flask	Several	100 mL
6	Test tube	Several	25 mL

2.2 Reagents

2.2.1 Reagents

Serial No.	Name	Technical Requirements	Anmerkungen
1	Hydrochloric acid	Guaranteed reagent
2	Nitric acid	MOS grade

3. Operational Procedures

3.1 Sample Processing

3.1.1 Preparation of Test Solution

Experimental method: Weigh 0.25 g of the sample into a beaker, add 15 mL of mixed acid (HCl: HNO₃: H₂O = 6:1:7), heat until completely dissolved, and cool. Transfer to a 100 mL volumetric flask, dilute to the mark, and mix well. Zero with the blank solution, and determine at a wavelength of 283.3 nm using an air-acetylene flame.

3.1.2 Preparation of Standard Solutions

Preparation of lead standard series: Accurately pipette 0.0, 0.1, 0.2, 0.4, and 0.8 mL of lead standard stock solution (1000.0 μg/mL) into 100 mL volumetric flasks respectively, dilute to the mark with (1+99) hydrochloric acid, and mix well. The concentrations of this solution series are 0.0, 1.0, 2.0, 4.0, and 8.0 μg/mL.

3.2 Sample Testing

Testing Conditions Reference conditions for flame atomic absorption spectrophotometer detection

Element	Blei
Wavelength (nm)	283.3
Spectral bandwidth (nm)	0.4
Element lamp current (mA)	6.0
Fuel height (mm)	6
Fuel flow rate (mL/min)	1500
Air compressor pressure (MPa)	0.22
Background correction method	None

Sample Testing Adjust the instrument to the optimal working state, ignite the flame, adjust the fuel flow rate, test the standard solutions and sample solutions in sequence, read the data, input the sample weight, and check and record the results.