水中痕量砷的脉冲极谱溶出法测定

砷的化合物具有强烈的毒性,水质分析中对于砷的水质标准有严格的限量,国内外饮水和地面水中砷的水质标准限度为10～50ppb,因此,要求有灵敏的测定水中痕量砷的方法。极谱法测定痕量砷已有一些报导。极谱催化波和示波极谱法能测定砷近ppb级,目前,用金电极的脉冲极谱溶出法测定砷的灵敏度检测下限甚至达0.02ppb,但金电极的制备有一定的技术要求,铜膜电极普通极谱溶出     

Passively Q-switched self-frequency doubling Nd~(3+):ReCa_4O(BO_3)_3(Re=Y,Gd) lasers with tin diselenide as a saturable absorber

With tin diselenide(SnSe_2) film as a saturable absorber(SA), the passively Q-switched self-frequency doubling(SFD) lasers were realized in Nd~(3+):ReCa_4O(BO_3)_3(Re = Y, Gd) crystals. For Nd:YCa_4O(BO_3)_3 crystal, the maximum average output power at 532 nm was 19.6 mW, and the corresponding pulse repetition frequency, pulse duration, single pulse energy, and peak power were 17.6 kHz, 91.9 ns, 1.1 μJ, and 12.1 W, respectively. For Nd:GdCa_4 O(BO_3)_3 crystal, these values were 14.5 mW, 22.1 kHz, 48.7 ns, 0.66 μJ, and 13.5 W.     

激光熔样-极谱法测定薄层中微量成分的研究

借激光可熔化并蒸发溶液中的固体试样,在溶液中吸收溶解为离子状态,因此,结合灵敏的测定方法,对固体试样进行区域和薄层的化学分析是可能的。我们借激光熔样,用极谱法测定,进行了探索研究。实验中我们用自装脉冲钕玻璃激光器熔样,国