Environmental quality control samples for expedited proficiency testing for calculating standards for testing and verifying the quality of water, soil and air

'air':22 'calcul':10 'control':3 'environment':1 'expedit':6 'profici':7 'qualiti':2,17 'sampl':4 'soil':20 'standard':11 'test':8,13 'verifi':15 'water':19

Chemical compounds, namely, expedited proficiency testing reagents and assays for calculating standards for testing and verifying the quality of water, soil and air

'air':23 'assay':9 'calcul':11 'chemic':1 'compound':2 'expedit':4 'name':3 'profici':5 'qualiti':18 'reagent':7 'soil':21 'standard':12 'test':6,14 'verifi':16 'water':20

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