HPLC法测定辽宁地区苦碟子中腺苷的含量

目的：建立高效液相色谱法测定苦碟子中腺苷含量的方法。方法：色谱柱为C18（250 mm×4.6 mm,5μm）,流动相为乙腈-水（9∶91）,检测波长260 nm,流速为1.0 ml/min。结果：腺苷进样量在0.070-0.70μg范围内与峰面积呈良好的线性关系（r^2=0.9998）;平均回收率为97.6%,RSD=0.72%（n=5）。结论：本方法简便、准确、重现性好,可用于苦碟子的质量控制。

Determination of Fe, Cu, and Zn in Water Samples by Microcolumn Packed with Multiwalled Carbon Nanotubes as a Solid Phase Extraction Adsorbent Using ICP-MS

The heavy metals determination in tap water samples using microcolumn packed with multiwalled carbon nanotubes （MWNTs） as a solid-phase extraction adsorbent before to their determination by inductively coupled plasma mass spectrometry （ICP-MS） has been studied. Standard addition method was applied for the calibration using aqueous solutions. The metals ions absorption were achieved by multiwalled carbon nanotubes （MWNTs） at pH 8.0, and then these retained metals on MWNTs column were eluted by 1.0 mol.L^-1 HNO3. The analytical parameters for the determination ofFe, Cu, and Zn in tap water samples which have been investigated previously were applied. Fifteen tap water samples were collected from different locations of Riyadh metropolitan area and then determined the concentration ofFe, Cu, and Zn by ICP-MS after preconcentration with MWNTs. The concentration range for Fe, Cu, and Zn measured （μg/L） in water samples are 23.37-137.91, 2.12-121.36, and 14.43-202.47 respectively. The level of Fe exceeded the limits set by WHO and SASO for drinking water.