我们知道,金属材料化学分析中,若溶样不完全,将会导致分析结果不准确。反之,若溶样时间过长,除浪费时间外,同样也可能造成较大的分析误差。譬如,当用挥发性酸溶样时,若由于害怕试样溶解不完全,而使加热时间过长,则会因酸的挥发使溶液酸度大大减小,从而影响测定结果。铸铁及一些含碳较高的钢铁品种,当分析需要取样较多时,由于溶样过程中会产生较多的含碳不溶物,常常使溶液变得浑浊不清(大多情况为灰黑色)。溶样将终时,不仅看不清溶液中是否还有试样颗粒存在,也分辨不出溶液中冒出的细泡是水汽泡还是样品溶解产 We know that the chemical analysis of metal materials, if the sample is not complete, will result in inaccurate analysis. Conversely, if the dissolution time is too long, in addition to wasting time, the same may also cause greater analytical error. For example, when using volatile acid to dissolve the sample, if the sample is not dissolved for a long time due to the fear of incomplete dissolution of the sample, the solution acidity will be greatly reduced due to the volatilization of the acid, which will affect the determination result. Cast iron and some of the more carbon-rich grades of steel often result in turbid solutions (mostly greyish-black) due to more carbon-containing insolubles during the sample preparation when the analysis requires more sampling. At the end of the sample dissolution, not only can there be no sample particles present in the solution, but also the resolution of the bubble in the solution as water vapor bubbles or sample dissolution