ANALYTICAL SEARCH FOR METALS IN TORTUGAS 

 MARINE ORGANISMS. 



By Alexander H. Phillips. 



This is the second instalment of analyses of marine organisms 

 collected at the Tortugas. The first was printed in the report of the 

 Carnegie Institution of Washington for 1917, where also the general 

 method of analyses was described. Owing to the smaller amounts of 

 both copper and zinc in these specimens, the method was modified and 

 the copper was determined by the ferrocyanide colorimetric method, 

 and zinc was determined by the terbidimetric method described by 

 Victor Berckner/ n .^ / 



Specimen. 



No. 

 614-0.... 



614-S 



614-T 



614-U.... 

 G14-A-B.. 

 614-A-R.. 

 614-Q... . 

 bl4-B-H.. 

 614-A-W . 

 614-W. . . 

 614-C-A.. 

 614-A-C.. 

 614-A-E.. 

 614-A-D. . 

 614-B-W\ 

 614-B-A 

 614-C.. .. 

 614-B-F. . 

 614-A-lt. 

 614-A-2i: . 

 614-AA-2 . 

 620-a-4... 

 615-A-l . . 



Name. 



Plexaura homomala 



Gorgonia flabellum 



Pseudoplexaura crassa . . . 



Plexaura flexuosa 



Eunicea crassa 



Eunicea rissose 



Biiarium 



Xiphigorgonia ameeps. . . 



Gorgonia acerosa 



Bryozoa 



Toxopneustes 



Mellita 



Clypeaster 



Ciypeaster 



Diadema 



Astrospecten 



Cassiopea xamachana . . . 



Pentaceras 



Holothurla bermudiana. . 

 Holothuria bermudiana. . 



Loggerhead sponge 



Unio % . . . 



Mud from Marquesas.Fla 



Weight 

 fresh. 



yms. 



1055 

 550 



1205 

 400 

 110 

 560 



1235 

 445 

 480 



1205 



1345 



1955 



* 



255 



10370 



1175 



1945 



725 



3623 



Weight 

 dried 

 at 110. 



gms. 

 398 

 288 

 418 

 172 

 98 

 260 

 461 

 190 

 141 



717 

 698 

 956 



97 

 127 

 472 

 402 

 404 



74 



280 



Copper. 



0.0006 

 .00025 

 .00022 

 .00024 

 .00014 

 .00018 

 . 00009 

 .00008 

 .00012 

 .00014 

 .00016 

 .00032 

 . 00026 

 . 00022 

 .00021 

 .00029 

 .00021 

 . 00036 

 .00012 

 .00011 

 .00013 

 .00026 

 .0032 



Zinc. 



.0016 



.0025 



.00023 



. 00024 



. 00052 



. 00066 



.00045 



.00148 



. 00208 



. 00084 



.00046 



. 00042 



. 00027 



.00034 



. 00006 



. 00092 



.00062 



. 00056 



.00034 



.00064 



.00094 



.0032 



.0018 



Iron. 



.0021 



.0032 



.0043 



.0043 



.0026 



.0034 



.0036 



.0032 



.0060 



.00196 



.0026 



.00015 



.0032 



.0036 



.0028 



.0032 



.00016 



.0029 



.00071 



.0031 



.0015 



.0261 



Manga- 

 nese 

 as Mno. 



0.00021 

 .00024 

 .00029 

 .00015 

 .00012 

 .00008 

 .00014 

 .00011 

 .00019 

 .00021 

 .00009 

 .00065 

 .00072 

 .00046 

 .0002 

 .00041 

 .00013 

 .00037 

 .00021 

 Trace. 

 .0030 



.0058 



* Not weighed. 



t Composed of the body walls, muscles, etc. 



j Composed of organs and intestine only. 



The weight of the sample taken for the determination of copper and 

 zinc was in each case 20 grams of the material, dried at 110° C. to 



» Jour. Bio. Chem. Soc, June 1919. 

 97 



