Poly[μ-aqua-aqua-(μ-benzene-1,2,4,5-tetra-carboxyl-ato)gadolinate(III)potassium(I)].

In the title compound, [KGd(C(10)H(2)O(8))(H(2)O)(2)](n), the Gd(3+) ion is nine-coordinated by eight O atoms from five individual benzene-1,2,4,5-tetra-carboxyl-ate (btec) ligands and one water mol-ecule, and the K(+) ion is eight-coordinated by six O atoms from five individual btec ligands and two water mol-ecules. In the crystal, the btec half-mol-ecules are completed by crystallographic inversion symmetry. GdO(9) and KO(8) polyhedra are connected, forming layers in the ab plane, which are further inter-connected by μ(8)- or μ(12)-bridging btec ligands, forming a three-dimensional structure.

[Determination of trace bismuth in traditional Chinese medicines by hydride generation atomic fluorescence spectrometry].

A method is reported for the determination of trace bismuth in traditional chinese medicine by hydride generation atomic fluorescence spectrometry. The effect of different means of digestion, the medium amounts of acid and reducing agent on the determination of Bi is investigated. In the given conditions, the linear range of determination is 0.

[Determination of trace mercury in the Chinese traditional medicine by hydride generation-atomic fluorescence spectrometry].

A hydride generation atomic fluorescence spectrometry method has been developed for the determination of trace mercury in traditional Chinese medicines. A high-pressure digestion using HNO3-H2O2 system was applied to the pretreatment of traditional Chinese medicine samples and an interval flow precedure was used. The experimental conditions and instrumental operation parameters such as KBH4 concentration, flow rates of carrier and shield gases, currents of lamp and height of atomic oven, which affect the determination, have been optimized respectively as 0.

[Determintion of trace lead in the traditional Chinese medicine using hydride generation atomic fluorescence spectrometry].

A hydride generation atomic fluorescence spectrometry method has been developed for the determination of trace lead in traditional Chinese medicines. A high pressure digestion using HNO3-H2O2 system was applied for the pretreatment of traditional Chinese medicine samples and the interval flow precedure was used. The experimental conditions and instrumental operating parameters such as KBH4 concentration, flow rates of carrier and shield gases, current of the lamp and height of the atomizer, have been optimized.