Operation Manual for - Mrclab.com

Ultrasonic milk analyzerTable IICalculation of casein content in the sheep milk on the base of used cubiccentimeters 0,1 N soda caustic:0,1 n NaOH cm 3 Casein% 0,1 n NaOH cm 3 Casein % 0,1 n NaOH cm 3 Casein %5,40 3,96 6,10 4,47 6,80 4,995,45 4,00 6,15 4,51 6,85 5,025,50 4,03 6,20 4,55 6,90 5,065,55 4,07 6,25 4,58 6,96 5,105,60 4,10 6,30 4,62 7,00 5,135,65 4,14 6,35 4,66 7,05 5,175,70 4,18 6,40 4,69 7,10 5,215,75 4,22 6,45 4,73 7,15 5,245,80 4,25 6,50 4,77 7,20 5,285,85 4,29 6,55 4,80 7,25 5,325,90 4,33 6,60 4,84 7,30 5,355,95 4,36 6,65 4,88 7,35 5,396,00 4,40 6,70 4,91 7,40 5,436,05 4,44 6,75 4,95 7,45 5,464.8. Measurement accuracy.Two parallel samples are measured and the difference between them couldnot exceed 0,1 %.The accuracy of the method require the work to be done at place with goodnatural illumination, titration to be done evenly, without interruptions, colorlessformalin to be used, preliminarily neutralized with soda caustic andphenolphthalein indicator.Formalin titration is easy method, but it is not enough precise. More accurateresults for casein content are obtained using Kjeldhal's method, but it requiresspecial appliances.5. Determination of salts in the milk5.1. GeneralFor the mineral substances in the milk conclusions can me made on theashes content.5.2. SamplingAccording Appendices Milk sampling and preparation of samples for analysesad Sampling and preparation of samples for verification the accuracy of themilk analyser, making corrections and recalibration.Operation manual 57/98