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Studies on reproduction of the International Opacity Reference Preparation.

The International Opacity Reference Preparation is a polydisperse suspension of glass particles, the size distribution of which it is hardly possible to reproduce. However, by mixing glass particles of different size distributions it seems practicable to prepare a suspension which is turbidimetrically almost identical to the International Opacity Reference Preparation. The proportions of the components of the mixture are estimated by simultaneous turbidimetry determinations in two photometers of different construction. The technique is described by the author, who also reviews experience with regard to the stability of the International Opacity Reference Preparation.

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SPECTROSCOPE.

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Humans↗