Analysis of Sea Water. 



19 



its quantity was likewise ascertained after the distribution of the 

 acids amongst the bases, when the surphis of the hme or of one 

 of the other bases must have been united to carbonic acid. The 

 quantity obtained by analysis was a httle less than the last, ow- 

 ing to the carbonate of barytes not being entirely insoluble in 

 water during lixiviation. Lime was separated by oxalate of am- 

 monia, the water having been previously mixed with a proper 

 quantity of chloride of ammonium. After the separation of lime, 

 magnesia was precipitated by the addition of ammonia and phos- 

 phate of ammonia. 



The precipitate was washed with water containing 10 per cent, 

 of ammonia, whereby the solution of the precipitate was preven- 

 ted. After the sea-water had been freed from the earthy chlo- 

 rides and sulphates by hydrate of barytes and carbonate of am- 

 monia, it was evaporated to dryness, and the residue heated to 

 redness, and weighed. The alkaline chlorides were dissolved in 

 water mixed with perchloride of platinum, and evaporated to dry- 

 ness. The residue digested with spirits of wine containing 60 

 per cent, alcohol, left potassio-chloride of platinum, which was 

 dried, weighed, and computed as chloride of potassium. The 

 surplus of the total amount of the alkaline chlorides will give the 

 precise quantity of the chloride of sodium. 



The equivalent numbers have been computed according to the 

 tables which H. Rose has affixed to his Handbiich der Analy- 

 tischen Chemie, Zweiter Band. 



I subjoin by way of comparison an analysis of the Mediterra- 

 nean by Laurens. {Journal de Pharmade, xxi, 93.) 



Water, - - - - 

 Chloride of sodium, 



of potassium, 



of magnesium, 



Bromide of magnesium, 

 Sulphate of magnesia, 



of lime, 



Carbonate of lime, 



Sea-water of the British Channel. 

 Grains. 



_ . . 964-74372 



27-05948 

 0-76552 

 3-66658 

 0-2929 

 2-29578 

 1-40662 

 003301; 



Of the Mediterranean. 

 Grains- 



- - 959-26 



- - 27-22 



- - 001 



- - 614 



Garb, of lime 

 and magnesia, 



7-02 

 0-15 

 0-20 



1000.00000 



1000-00 



