PER0XYLAMINESTJLPH0NATE8 AX!» HYDR0XYLÀMINE1 RISULPHONATES. :;<» 



s ii I] »holm te was in this instance 1*03 percent, of thai of the hydroxy 1- 

 aminedisulphonate used. 



To determine the total nitrogen in the solution, the nitrite was com- 

 pletely sulphonated to aminetrisulphonate (nitrilosulphate) by addin" 1 

 enough potassium carbonate for the purpose and then passing in 

 sulphur dioxide until a piece of lacmoid-paper was just reddened (this 

 Journ., 6, 65). Next, the hydroxylaminetrisulphonate in (he solution 

 was reduced by sodium amalgam, as above described, to sulphate and 

 aminedisulphonate. Having thus broughl all the nitrogen to the 

 state oi* aminesulphonates, the hydrolysis of these substances l>v 

 hydrochloric acid was effected by heating, first, on the water-bath 

 until all the sulphur dioxide had been expelled, and then for some hours 

 in a pressure-tube at 150 . The solution distilled with alkali gave up 

 all its nitrogen as ammonin. The difference between this and 

 that originally present as peroxylaminesulphonate gives, indirectly, 

 the quantity of nitrogen in the Liases, whilst the difference, again, 

 between the total nitrogen in the solution and the sum of the quanti- 

 ties found as disulphonate and trisulphonate is the nitrogen which 

 was present as nit rite. 



Although the experimental work in estimating sulphate and 

 hydroxylaminetrisulphonate was performed with great care, no high 

 degree of accuracy in the results could lie expected. A test experi- 

 ment was made to see to what extent the method was imperfect. A 

 solution was prepared by dissolving potassium sulphate, potassium 

 hydroxylaminetrisulphonate, potassium hydroxylaminedisulphonate, 

 and sodium nitrite in water to every I'M) c.C. of which ."> c.e. of X/10 

 solution of potassium hydroxide had been added. The solution was 

 twice analysed for sulphate and trisulphonate, in the way described 

 above. The quantities, taken and found, are here given in grams per 

 100 ce. 



