bids are invited for crm13 ph buffer solution 10.00 traceable to si unit, iso 17034 , ph buffer solution 4.00 traceable to si unit, iso 17034 , ph buffer solution 7.00 traceable to si unit, iso 17034 , potassium chloride solution traceable to si unit, iso 17034 , calcium carbonate volumetric standard, secondary reference material for complexometry , fluoride standard solution 1000 mg per lit. traceable to si unit, iso 17034 , nitrate standard solution 1000 mg per lit. traceable to si unit, iso 17034 , potassium chloride traceable to si unit, iso 17034 , sodium carbonate volumetric standard traceable to si unit, iso 17034 , sodium chloride volumetric standard, traceable to si unit, iso 17034 , sodium sulfate anhydrous 99.99 suprapur , sulphate standard solution traceable to si unit, iso 17034 , bod standard ,analogue en 1899, standard solution total quantity : 14