GENERAL • The specification is to furnish the Sewerage and Water Board Water Quality Laboratory with an ICP-MS (Inductively Coupled Plasma Mass Spectrometer). The ICP-MS must be capable of running EPA method 200.8 revision 5.4, an approved method under the SDWA. The primary focus will be the analysis of dissolved lead and copper elementsin drinking water in anticipation for EPA’s implementation of Lead and Copper Rule Revisions. We will also use the instrument for process control by using the collision cell technology in our noncompliance methods to monitor our drinking water for other contaminants without the restriction of EPA method 200.8. TECHNICAL • The instrument shall be equipped with a single quadrupole mass spectrometer capable of scanning the mass range 5-250 amu with a minimum resolution capability of 1 amu peak width at 5% peak height or approved equal. • The sampler cone opening should be no larger than 1.0 mm in diameter and the skimmer cone opening should be no larger than 0.45 mm in diameter or approved equal. The skimmer cone will have a highpressure zone before the extraction lens or approved equal to achieve high sensitivity. • The ICP-MS will have twin extraction lenses or approved equal with an off an omega style off- axis ion lens or approved equal to minimize background and give low detection limits to analytes. The lens will be quickly accessed for routine maintenance without the need to shut off the main vacuum system or approved equal. • The instrument shall have an octupole based collision cell which will use only Helium gas and not a gas mixture for collision cell mode or approved equal. • The instrument will have an orthogonal detector system with the capability to analyze elements over a concentration range of 10 orders of magnitude or approved equal. • An autosampler with a cover kit shall be included with the system and should be able to hold up to 360 samples or approved equal. The ICPMS instrument controller software will also be used to operate the autosampler. When creating a sampling schedule, the user will only need to create one sampling schedule which will apply to both the ICP- MS and the autosampler. • The ICP-MS system will include an auto dilution system for the preparation of calibration standards and intelligent auto dilution of samples or approved equal. The auto dilation unit will be integrated with the ICP-MS software or approved equal. The software will be able to assist in defining calibration range and a multipoint calibration curve is automatically generated from the analyst’s stock solution or approved equal. When a sample is measured above the calibration range, the software can automatically calculate the appropriate dilution factor using an algorithm to rerun the sample or approved equal. The auto dilution system must be serviced by the ICP-MS manufacturer and covered under ICP-MS warranty and service agreements at no additional cost or approved equal. • The ICP-MS system shall have a chiller which uses a water circulator and a water level sensor. • The system should have only one exhaust vent to reduce the cost of onsite preparation or approved equal.
