Table 2-1 



Summary Of Laboratory Analytical Work, Summer 1991 



TYPE OF TEST 



TEST METHOD 



INSTRUMENTATION 



Metals 





EPA Test Method No. 







Sample 



Prep 



Analytical 





Cadmium (Cd) 



3050 





7131 



GFAA 



Lead (Pb) 



3050 





7421 



GFAA 



Zinc (Zn) 



3050 





6010 



ICP 



Polvnuclear Aromatic 



3540 





8270 



GCMS 



Hydrocarbons (PAHs) 











Total Organic Carbon 







9060 





Grain Size 



ASTM D422-63 







2.3.3 Metal and PAH Analyses 



Samples were analyzed using standard EPA procedures (Table 2-1). Cadmium and 

 lead were analyzed by graphite furnace atomic absorption techniques and zinc by inductively 

 coupled argon plasma emission spectrophotometry (ICP). Atomic absorption techniques with 

 a graphite furnace allow for low detection limits. The graphite furnace heats digestates in 

 several stages, allowing removal of unwanted matrix components. Atomic absorption 

 spectrophotometry determinations are completed as single element analyses. Analysis by ICP 

 allows simultaneous or rapid sequential determination of many different metals. The 

 detection limits associated with ICP analysis are frequently higher than those with atomic 

 absorption spectrophotometry. Polynuclear aromatic hydrocarbons were analyzed by EPA 

 Method 8270 which utilizes gas chromatography /mass spectrophotometry (GC/MS). 



2.3.4 QA/QC 



The NED laboratory submitted results that were acceptable and supported by 

 appropriate documentation. The laboratory reported acceptable method detection limits, 

 based on results obtained from the method blank processed with the samples. Several PAH 



Monitoring Cruise at the Central Long Island Sound Disposal Site, June 1991 



