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4.1. spectrophotometrically pure iso-octane (2,2,4-trimethylpentane). with reference to distilled water this should have a transmittance of not less than 60 % at 220 nm and not less than 95 % at 250 nm, or
spectrofotometrisch onderzoek in het ultraviolette gebied kan informatie verschaffen over de kwaliteit van een vet, de toestand van bewaring en veranderingen veroorzaakt door technologische processen.
reference gasoline mixture of 50% by volume of toluene, 30% by volume of 2,2,4‑trimethylpentane, 15% by volume of 2,4,4-trimethyl-1-pentane and 5% by volume of ethyl alcohol.
referentiebenzine: mengsel van 50 volumeprocent tolueen, 30 volumeprocent 2,2,4-trimethylpentaan, 15 volumeprocent 2,4,4-trimethyl-1-pentaan en 5 volumeprocent ethylalcohol.
petrol or equivalent reference petrol: a mixture of 50 % by volume toluene, 30 % by volume 2,2,4-trimethylpentane, 15 % by volume 2,4,4-trimethyl-1-pentene and 5 % by volume ethyl alcohol:
benzine of gelijkwaardige referentiebenzine: mengsel van 50 volumeprocent tolueen, 30 volumeprocent 2,2,4-trimethylpentaan, 15 volumeprocent 2,4,4-trimethyl-1-penteen en 5 volumeprocent ethylalcohol.
