6 BULLETIN 466, U. S. DEPARTMENT OF AGRICULTURE. 



Table IV. — Effect of concentration of sirup on ash and malic acid values (Jones). 





Ash. 



Malic 



Concentration. 



Total. 



Soluble. 



Insolu- 

 ble. 



acid 

 value. 





Per cent. 

 1.02 



.80 

 .77 



Per cent. 



0.45 



.48 



.49 



Per cent. 



0.57 



.32 



.28 



1.00 



Average of 42 sirups having from 30 to 34 per cent water 



.71 

 .66 







> Vt. Agr. Exp. Sta. Bui. 107, p. 466. 



It is necessary, then, to use care not to concentrate a sample of sirup 

 made from the sugar under examination beyond a certain point, as 

 there might be a precipitation of material which would cause the 

 analyst to believe the sample was adulterated. The data contained 

 in Table V show the likelihood of such an occurrence. 



Table V. — Effect of addition of vjater on ash and malic acid values (Jones). 1 





Original sirup. 



Water added and heated. 



Sample No. 



Moist- 

 ure. 



Ash. 



Malic 

 acid 

 value. 



Moist- 

 ure. 



Ash. 



Malic 



acid 



value. 





Total. 



Solu- 

 ble. 



Insolu- 

 ble. 



Total. 



Solu- 

 ble. 



Insolu- 

 ble. 



105 



Per ct. 

 30.53 

 29.99 

 29.46 

 27.90 

 29.04 

 30. 69 

 30.94 

 31.04 

 26.75 

 28.29 

 30.70 



Per ct. 

 0.79 

 .75 

 .69 

 .71 

 .65 

 .71 

 .67 

 .72 

 .72 



^74 



Per ct. 

 0.54 

 .50 

 .47 

 .50 

 .45 

 .49 

 .44 

 .51 

 .44 

 .53 

 .51 



Per ct. 

 0.25 

 .25 

 .22 

 .21 

 .20 

 .22 

 .23 

 .21 

 .28 

 .24 

 .23 



0.01 

 .73 

 .60 

 .58 

 .49 

 .56 

 .65 

 .62 

 .90 

 .07 

 .61 



Per ct. 

 39.21 

 37.25 

 35.40 

 35.05 

 33.27 

 35. 75 

 35.62 

 38.00 

 35.95 

 39.40 

 35.75 



Per ct. 



0.81 



.96 



.77 

 .79 

 .75 

 .92 

 .81 

 .87 

 .78 

 .80 

 .87 



Per ct. 

 0.53 

 .55 

 .43 

 .54 

 .52 

 .65 

 .56 

 .61 

 .51 

 .60 

 .53 



Per ct. 

 0.28 

 .41 

 .34 

 .25 

 .23 

 .27 

 .25 

 .26 

 .27 

 .26 

 .34 



0.63 



113 





104... 



.74 



107 



.61 



108 



.52 



114 



110 



.62 



.61 



115 



91 



.60 

 .61 



Ill 



.66 



117... 



.64 







Average 



29. 63 



.72 



.49 



.23 



.64 



36.42 



.83 



.55 



.28 



.63 



i Vt. Agr. Exp. Sta. Bui. 167, p. 471. 



The original samples were concentrated in each case below the 65 

 per cent solid content and showed low analytical figures in most 

 cases. Taking these same samples, with the sediment contained 

 therein, and adding water and boiling again to about a 35 per cent 

 moisture content, the analytical figures, with the possible exception 

 of No. 108, where the second concentration is below 35 per cent, are 

 well within the bounds of pure products. Average figures show that 

 changing the concentration from 29.63 per cent water to 36.42 per 

 cent has increased the ash from 0.72 to 0.83 per cent, and the insoluble 

 ash from 0.23 to 0.28 per cent, but has not changed the malic acid 

 content. From this, it is seen that in concentrating the maple sugar 

 sirup for analysis the dry substance of the finished sirup should not be 

 much over 65 to 66 per cent. 



