Trace Element Analysis For Waste Solutions

Trace element analysis for waste solutions

The Woodlands, TX — June 28, 2004. The influence of trace heavy elements, such as Cd, Pb, As, Cr, and Se, in water is a serious environmental problem. Rigaku has developed a UltraCarry method for testing samples in order to control this problem by monitoring wastewater quality. The method is simple, rapid, reproducible, and easily traceable to certified water standards.

The method uses a standard X-ray fluorescence (XRF) spectrometer—such as the Rigaku ZSX Primus—to provide results comparable to those of trace elements analyses performed by ICP-OES and AA. XRF has an advantage in that concentrations of the elements B through U can be determined non-destructively in a single analysis sequence.

For trace element analysis of liquid samples with an XRF spectrometer, an improved micro-droplet method has been developed which enables analysis to ppb levels for these environmentally sensitive elements
Performance of the high-sensitivity micro-droplet method

High-sensitivity filter paper (UltraCarry®) has a simple structure where special paper for capturing elements is placed on very thin film.

The Lower Limits of Detection (LLDs) with UltraCarry are shown in Table 1. This new method expands normal XRF methods to the level needed for environmental testing of wastewater and effluents required by the changing demands of industry.


Table 1. The LLD table. (Unit: ppb)
Element LLD Element LLD Element LLD Element LLD
B 30ppm Cr 26 Zn 18 Cd 182
F 1ppm Mn 16 As 16 Sn 40
Na 76 Fe 18 Se 24 Sb 43
P 56 Co 17 Sr 25 Ba 105
K 12 Ni 20 Mo 27 Tl 81
V 34 Cu 19 Ag 152 Pb 76

Measuring time: 100s

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Since its inception in Japan in 1951, Rigaku has been at the forefront of analytical and industrial instrumentation technology. Rigaku and its subsidiaries form a global group focused on life sciences and general purpose analytical instrumentation. With hundreds of major innovations to their credit, Rigaku companies are world leaders in the fields of small molecule and protein crystallography, X-ray spectrometry and diffraction, X-ray optics, as well as semiconductor metrology. Rigaku employs over 1,100 people in the manufacture and support of its analytical equipment. Its products are in use in more than 70 countries—supporting research, development, and quality assurance activities. Throughout the world, Rigaku continuously promotes partnerships, dialog, and innovation within the global scientific and industrial community.

For further information, contact:

Tom McNulty
XRF Product Manager
Rigaku Americas, Inc.
Tel: (281) 362-2300 x207
eMail: Tom McNulty