气相分子吸收光谱法测量富含阴离子表面活性剂水样中氨氮的研究

Study on determination of ammonia-nitrogen in water samples rich in anionic surfactant by gas-phase molecular absorption spectrometry

气相分子吸收光谱法测量富含阴离子表面活性剂的氨氮水样时,在盐酸-乙醇载流液中加入适量消泡剂,可以明显降低水样中通入载气时造成的泡沫过多现象,从而避免泡沫随载气进入仪器吸光管,保障测定进程。通过加入消泡剂与不加消泡剂的实验比较,结果表明,加入消泡剂具有明显的消除泡沫作用而不影响测定的准确度和精密度。

When measuring,the gas bubble produced by the entry of carrier gas into the water can be significantly reduced by the addition of antifoams in hydrochloric acid-ethanol carrier liquid.Therefore,the determination process can be ensured through the decrease of the entry rate for the bubble into the instrument light absorption tube with the carrier gas.The experimental results showed that the bubble production could be effectively eliminated by adding antifoams,and the accuracy and precision of measurement had no effect.