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Pipet-Aid® XL
Advanced
Ergonomics for Working Under a Hood
Reduce Strain Longer lightweight handle enables lower, more comfortable arm position
Extend Uninterrupted Operation Periods Quiet more efficient pump can be charged while in use to eliminate downtime
Excellent Control Three speed settings enable precise volume control for both aspiration and dispensing operations
The Pipet-Aid® XL is designed specifically to reduce the strain involved when pipetting under a hood.
For a copy of our new 2013 catalog or more information on the Pipet-Aid XL visit
drummondsci.com.
From the Developers of the Original Pipet-Aid®
MADE IN USA
500 Parkway, Box 700 Broomall, PA 19008
TOTAL MERCURY CONTENT continued
Figure 2 – Measurement results: total Hg content in roof beams from dif- ferent time periods.
Table 3 – Total Hg content of selected real wood samples from different origin
Sample name Timber Old window frame
Average (n = 3) (mg/kg)
0.428 0.198
Half-timbered construction 0.139 Railroad tie location 1 Roof beam from 1910 Railroad tie location 2 Railroad tie location 3
0.186 0.377 0.096 0.209
SD (mg/kg)
0.011 0.006 0.023 0.016 0.002 0.011 0.005
CV (%)
2.59 2.98
16.48 8.46 0.39
10.95 2.34
in waste wood. A limit of detection of 2.29 μg/kg was realized using this method. In comparison to classical ICP-OES, the LOD was reduced by more than 98%; compared with cold vapor ICP-OES, the LOD was about 1 μg/kg lower. The results for wood analysis show good correlation to the results from the literature in which solids such as coal were determined using cold vapor ICP-MS.18
Sample preparation was performed using microwave digestion with two acid compositions and two types of microwave vessel. Optimal results were achieved using aqua regia in the XP1500 vessels. In seven of the real wood samples analyzed, increased mercury content in the range of 0.10–0.43 mg/ kg dried wood material was found. In the samples from the surrounding environment, no mercury was detected. The method presented enables rapid determination of wood materials such as treated waste wood and natural environmental samples.
References 1. Keil, D.E.; Berger-Ritchie, J. et al. Labmedicine 2011, 42(12), 735–42.
AMERICAN LABORATORY • 10 • SEPTEMBER 2013
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