Manual
Contents
1. STANDARD OPERATION PROCEDURES SOP FOR 7 STAGE MERCER U 4 5 CASCADE IMPACTOR Preparing Mercer Impactor for Samplin Lay the 7 stainless steel collection disks onto a clean work surface in a ventilated chemical hood and carefully with a q tip apply a thin even layer of grease solution supplied by the manufacturer on each disk Let the disks dry for about 10 minutes reduced accuracy of measurements On the other hand make sure that ATTENTION Do not overgrease the disks Overgreasing may results in disks get enough grease in order to avoid particle loss due to bounce Weigh the stainless steel collection disks and a 25 mm filter Log in the weights Inspect the impactor jet plates and make sure that their rubber O rings are placed properly and do not show signs of damage Place the jet plate labeled with the number 7 on the working surface and with the help of a pair of tweezers carefully center on it one of the stainless steel collection disks Note in you laboratory book the weight of the collection disk corresponding to Stage 7 On top of Stage 7 stack up the jet plate labeled with the number 6 Place another collection disk on it and mark down the weight of the collection disk Repeat this procedure until all the stages from 7 bottom to 1 top are loaded with their collection disks and stacked up on top of each other Make sure the weights of the collection disks are properly identified for each stage F2. or the data use a table like the following Weight before Weight after Collected exposure exposure Mass Align the impactor barrel with the stack of stages and slowly but firmly push it down until the whole stack starting from Stage 1 is fully inserted Place a weighted 25 mm filter in the filter holder inside the impactor s tail piece 6 Hold the tail piece with one hand and screw in the loaded impactor barrel with the other while keeping it upright stage 7 at the bottom Do not overtighten Attach the nose piece on the other side of the barrel Do not overtighten Slide the impactor inlet into the impactor sampling adaptor Connect the sampling line to the push to connect fitting 0 Using an appropriate flow measuring device primary standard or standard traceable check the impactor s flow rate Note the flow rate on your laboratory book Se eo Sampling with the Mercer Impactor 1 Unplug an exposure port designated for sampling and connect the impactor sampling adaptor to it 2 Connect the sampling line to the impactor 3 Start sampling and at the same time start measuring the sampling time with a laboratory timer 4 When the pre determined sampling time is up stop sampling Write down the sampling time concentration in the chamber The higher the concentration the shorter time needed to collect on the discs the necessary amount of material Oversampling may results in reduced acc
3. uracy of measurements of the larger fractions as a result of particles bouncing on the collected material On the other hand undersampling may result in collection of negligible amounts of material in the lower stages ATTENTION Length of sampling time will depend on the expected Nn Disconnect the impactor from the sampling exposure port and plug the port immediately Disconnect the sampling line from the impactor outlet Move the impactor to a clean ventilated working area Unscrew and remove both nose and tail pieces Pick up with a pair of tweezers the filter from the tail piece and weigh it Log in the weight in the data table 10 Hold the barrel upright Stage 7 at the bottom and using the pusher provided with the impactor kit remove the stages one by one by pushing them from beneath As each stage comes out of the barrel pick up their collection disks with tweezers and weigh them Log in all their weights in the data table 11 Continue the analysis procedure according to the analysis SOP a sec aa Analyzing Data Collected with Mercer Impactor To calculate the MMAD and GSD values for the sampled aerosol use either the manual method log prob graph paper as described on the User s Manual or enter the data collected mass on discs sampling time and sampling flow rate on the provided Excel spreadsheet The latter one is faster easier and more accurate
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