Thermodynamics analysis indicated that water absorption mass was relevant to both the water dipping temperature and the temperature distribution along the nonel tube.

Determination of trace Ba in water by graphite furnace atomic absorption spectrometry is studied. The optimum graphite tube, heating programs and matrix modifier are investigated.

By weight method, the water absorption law and its effect on the propagation reliability of plastic nonel tube under different water dipping conditions were investigated in this paper.