bids are invited for ammonia buffer solution 500 ml, merck - merck; catalouge number: 61759205001730 , silver nitrate for analysis emparta® acs, merck - merck; catalouge number: 1.93200.0027 , bromocresol green 0.04% indicator solution, merck - merck; catalouge number: 61840201251730 , l(+)-ascorbic acid for analysis emsure® acs, iso, reag. ph eur, merck - merck; catalouge number: 1.00468.0100 , hydrochloric acid about 37% for analysis emparta® acs, merck - merck; catalouge number: 1.93001.2521 , nitric acid about 69% for analysis emparta® acs, merck - merck; catalouge number: 1.93006.2521 , tisab solution for fluoride determination, merck - merck; catalouge number: 1.15368.0500 , sodium borohydride emplura® 500 g, merck - merck; catalouge number: 1.94962.0521 , potassium bromate for analysis emparta® acs, merck - merck; catalouge number: 1.93297.0521 , magnesium chloride hexahydrate for analysis emsure® acs, iso, reag. ph eur, merck - merck; catalouge number: 1.05833.0250 , potassium iodide emplura®, merck - merck; catalouge number: 1.93601.0251 , potassium standard solution traceable to srm from nist kno3 in hno3 0.5 mol/l 1000 mg/l k certipur, merck - merck; catalouge number: 1.70230.0500 , potassium chloride solution (nominal 1.41 ms/cm) certi reference material for the measurement of electrolytic conductivity, traceable to ptb and nist (c=0,01 mol/l) certipur, merck - merck; catalouge number: 1.01553.0001 , sodium chloride volumetric standard, secondary reference material for argentometry, traceable to nist srm certipur, merck - merck; catalouge number: 1.02406.0080 , sodium carbonate volumetric standard, secondary reference material for acidimetry, traceable to nist srm certipur, merck - merck; catalouge number: 1.02405.0080 total quantity : 1