248 
Disinfectants  and  Algicides. 
(Am.  Jour.  Pharm. 
1      June,  1913. 
Copper  sulphate  should  be  used  as  an  emergency  treatment  for 
eradicating  odor-producing  algae. 
For  the  convenience  of  those  who  wish  to  superintend  personally 
the  treatment  of  water  for  removing  algal  pollutions,  I  have  pre- 
pared tables  showing  the  quantity  of  copper  sulphate  required  to 
eradicate  the  more  common  forms,  and  also  the  concentration  be- 
yond which  copper  sulphate  may  be  dangerous  for  several  kinds  of 
fish. 
Table  I  Showing  Quantity  of  Copper  Sulphate  Required  to  Kill 
Various  Forms  of  Odor-producing  Organisms. 
Copper  sulphate  expressed  as  parts  per  million  (mg/1). 
Anabaena   0,09 
Asterionella   0,10 
Beggiatba    5,00 
Cliara    0,20 — 5 
Claclophora    1,00 
Cladothrix    0,20 
Clathrocystis   0,10 
Coelosphaerium    0,30 
Conferva   0,40 — 2 
Crenothrix    0,30 
Euglena    1,00 
Fragilaria    0,25 
Hydrodictyon   •  •  0,10 
Kirchneriella    5,00 — 10 
Leptomitus    0,40 
Microspora   0,40 
Navicula    0,07 
Oscillatoria    0,10 — 0,40 
Peridinium    2,00 
Scenedesmus   5,00 — 10 
Spirogyra    0,05 — 0,30 
Ulothrix    0,20 
Uroglena    0,50 
Volvox    0,25 
Zygnema    0,70 
Table  II  Showing  Occurrence  of  Twelve  Genera  of  Alcf:  Most  Fre- 
quently Reported  as  Causing  Trouble  in  Reservoirs  and  Ponds. 
Number  of  cases. 
Anabaena    27 
Asterionella    9 
Beggiatoa   20 
Chara   26 
Cladophora    17 
Clathrocystis    23 
Conferva    56 
Crenothrix   13 
Fragilaria    19 
Navicula    21 
Oscillatoria    49 
Spirogyra    43 
Table  III  Showing  Safe  Limit  for  Treating  Water  with  Copper 
Sulphate  when  Certain  Fish  are  Present. 
Copper  sulphate  expressed  as  parts  per  million  (mg/1). 
Black  Bass   (Zander)   2,10  Pickerel  (Hecht)    0,40 
Carp  (Karpfen)   0,30  Suckers    (Seehase)    0,30 
Catfish   0,40  Sunfish  (Sonnenfisch)    1,20 
Goldfish  (Goldfisch)    0,50  Trout  (Forelle)   0,14 
Perch  (Barsch)   0,75 
