Scholander Dissolved Gas Analyzer 



The analyzer for dissolved gases employed in this 

 study (fig. A2) was originally devised for the purpose of 

 performing analyses for oxygen and nitrogen in samples of 

 1 cc of water. 5 In expert hands the accuracy of results 

 obtained by this method are comparable to results from the 

 unmodified micro Winkler titration and have the advantage 

 of immunity from the possible effects of interfering sub- 

 stances. To the best of the author's knowledge this is the 

 first reported instance of the use of this versatile instrument 

 for the determination of dissolved carbon monoxide. Preci- 

 sion of duplicate analyses is nearly always within 0. 2 to 0. 3 

 percent by volume, the accuracy generally of the same order. 



The precision bore capillary graduated in 100 divi- 

 sions, employed in the analyzer for this study, was found 

 upon calibration to have a volume equal to 28. 5 mm 3 . The 

 meniscus within the capillary could be read by use of a 

 hand lens to ±0. 2 to 0. 3 division making the reading error 

 at best equal to ±0. 057 mm 3 . 



Because accuracy for analytical results obtained by 

 this method can be claimed to be no greater than about ±0. 06 

 mm 3 , the data given in Appendix C are expressed to two 

 significant decimal figures only. The data arising from 

 analyses performed with the gamma-burette, however, are 

 actually accurate to ±0. 001 mm 3 or better. 



All analyses discussed in this report, with the excep- 

 tion of the confirmatory analysis upon Rhtzophysa sp. and 

 some of the blanks and calibrations, were performed aboard 

 ship under varying, though usually mild, sea states. 



39 



