A transparent and homogeneoussample solution was obtained by dissolving the surfactant of sodium salt in HNO3 (1 + 1) -op solution upon heating.
在加热下用硝酸(1 + 1)- OP溶液溶解钠盐表面活性剂样品,配制成均匀透明的样品溶液。
2
Place the gauge on a horizontal, flat , non-slip surface . Stir the samplehomogeneous with small palette knife , and the pour sufficient liquid into the deep end of the gauge channel.