Various modifiers were investigated regarding their influence on the characteristic mass and memory effect for boron determination by graphite furnace spectrometry. The best results were obtained using a zirconium nitrate-nickel nitrate mixed modifier, which resulted in high sensitivity (characteristic mass 200 pg), negligible memory effect, and increased tube lifetime (about 200 atomization cycles at 2800 °C). The method was successfully applied to determine boron in river water, drinking water, and sewage.
This document details a method for determining boron using graphite furnace atomic absorption spectrometry (GFAAS). It addresses the challenges of boron forming refractory carbides, which typically lead to poor sensitivity and memory effects. The study investigates various chemical modifiers to improve performance.
The authors found that a combination of zirconium nitrate and nickel nitrate provides the best results. This mixture offers high sensitivity (characteristic mass of 200 pg), negligible memory effect, and extended tube life. The method was successfully applied to analyze boron in river water, drinking water, and sewage samples.
| Characteristic Mass | 200 pg |
|---|---|
| Tube Lifetime | about 200 atomization cycles |
| Atomization Temperature | 2800 °C |
| Absorption Wavelength | 249.8 nm |
| Slit Bandwidth | 0.2 nm |
| Detection Limit | 0.06 mg/L |
| Determination Limit | 0.18 mg/L |
The best results were obtained using a zirconium nitrate-nickel nitrate mixed modifier.
The method offers increased sensitivity, shorter analysis time, no memory effect, longer tube life, and no need for pre-treatment of the graphite tube.
Yes, the method is suited for river water, drinking water, and sewage samples without requiring the standard addition method.