Koch K R
Department of Chemistry, University of Cape Town, Rondebosch, Republic of South Africa.
Analyst. 1990 Jun;115(6):823-5. doi: 10.1039/an9901500823.
A method for determining the Al levels in tea leaf digests and tea infusions by means of 27Al nuclear magnetic resonance (NMR) spectroscopy is described. Quantitative results down to 2.0 micrograms cm-3 of Al in 0.5-cm-3 acidified samples are readily obtainable in standard 5-mm NMR tubes. An acceptable quantitative determination is achieved by using an internal Al standard in a 1-mm capillary in conjunction with europium nitrate as a shift reagent.
描述了一种通过27Al核磁共振（NMR）光谱法测定茶叶消化液和茶汤中铝含量的方法。在标准5毫米NMR管中，很容易获得0.5立方厘米酸化样品中低至2.0微克每立方厘米铝的定量结果。通过在1毫米毛细管中使用内部铝标准物并结合硝酸铕作为位移试剂，可实现可接受的定量测定。
