This hereby amends Solicitation Number SB1341-07-RQ-0188 to modify the specifications as follows: Specification/Features A direct mercury analyzer system must possess a built-in autosampler, integrated sample drying, thermal decomposition, amalgamation and spectrophotometry. The autosampler must be programmable, capable of using variably sized sample boats, and able to transport samples in a smooth, fast sample method. The system must have a spares kit that includes: decomposition tubes, amalgamator, sample boats, and mercury trap. The system must comply with US EPA Method 7473, such that the system must have: ? Wavelength of detection: 254 nm ? Detector: UV photodetector ? Detection limit: 0.01 ng Hg ? Solid sample weight: at least 0.5 g ? Liquid sample volume: up to 1000 uL ? Working range : 0.05 ng to 600 ng ? Reproducibility: less than 1.5 percent ? Analysis time: Approx. 5 minutes per sample ? Sample treatment completely programmable: ? Drying time: between 0 and 300 sec. ? Drying temperature: between 50-400 degrees C ? Decomposition time: between 0 and 420 sec. ? Adjustable decomposition temperature, up to 900 degrees C, with temperature sensor ? Halogen removal system, including additives and liquid scrubber, to reduce the degradation of the catalyst ? Standby amalgamator temperature variable from 150-200 degrees C ? Amalgamator heating temperature up to 800 degrees C ? Adjust release time for amalgamator (0-30 seconds) ? Recording time adjustable (0-60 seconds) ? Calibration to be performed with solid or liquid standard reference materials ? For liquid calibration, can input an infinite amount of measurements for the same data point. Data can be added to existing calibration curve. ? Ceramic boats, holding up to 1000 uL, that optimize conditions for unattended analysis of liquids, clinical and other sensitive samples in a full autosampler rack Software/Hardware: ? Displays real time graphical representation of the sampling process ? Provides a means for portable data storage, such that the data can be transferred into other spreadsheet/analysis programs, such as Excel. ? Interfaces to an analytical balance and printer ? Upload sample weights, run sample programs, document and export data. Features include calibration, sample concentration, blank subtraction and data manipulation ? User specified data calculation, allows operator to choose data sets for statistical evaluation ? Validate data versus a stored calibration curve and automatically adjust results without recalibrating to improved the accuracy of measured data ? Store multiple calibration curves ? Store up to 150 sample results per data file ? Choose linear, second order, or third order fit for calibration curves ? Provides a statistical validation of the calibration curve ? Easily switches between manual and automatic mode ? Easy data identification. User can specify a file name for all data sets ? Switch from sampling mode to data mode to view graphs ? Software measures peak height or peak area (operator?s choice) ? Conveniently add additional samples to the autosampler while a sample run is in progress Data ? Printable data report includes the following information in list format: Sample number, Sample identification, Weight absorbed, Hg concentration (ng), Blank Correlation, Notes, Dry temperature, Dry time, Decomposition temperature, Decomposition time, Wait time, Amalgamator heat time, Recording time ? Print individual sample graphs (measurement peaks with absorbance values) ? Print calibration curves Support ? On-site installation and training by a factory trained service engineer in our laboratory must be available. ? The system must be manufactured and supported by the company using a dedicated product manager and full applications/service support staff ? A thorough Applications Library and a simple instrument operation manual must be provided with the system Warranty ? A 24 month warranty including parts and labor must be provided. The due date for quotes is hereby extended through Friday, June 15, 2007, 3:30:00PM EST. All other terms and conditions remain the same.

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