NSWC/WOL/TR 75-35 



The Phleger Corer is a compact, general purpose sampler for 

 obtaining sediment cores. Core retention is accomplished by a 

 simple positive-displacement valve arrangement providing closure of 

 the top of the tube. The resulting vacuum created inside the tube 

 when it is withdrawn from the sediment holds the core securely in 

 the buterate core liner. Little wash out is experienced at the 

 bottom of the sample, and no loss is possible at the top portion of 

 the core. Upon return to the surface, the clear buterate core 

 liner is easily removed from the corer. The liners are replaceable 

 and provide positive support of samplers for permanent storage or 

 for when it is desirable to split the core container for 

 cross-section analysis. 



3.2.4 Storage of Sediment Samples 



The same principles for the storage of water samples should 

 also be applied to the storage of sediment samples. In addition, 

 attention must be given to the effect of biological activity on the 

 sample characteristics in the sediment samples. The concentrations 

 of micro organic and inorganic components in sediment samples are 

 liable to change rapidly on storage owing to bacterial or enzymatic 

 action. If possible, samples should be analyzed within an hour of 

 collection; if the analysis has to be delayed, they should be placed 

 in glass bottles and immediately frozen with dry ice on board ship. 

 The samples can then be brought back to the laboratory and stored in 

 a deep freeze until analyzed. 



IV 



DETERMINATION OF EXPLOSION PRODUCTS 



4.1 DESIGN OF MEASUREMENT SYSTEM 



There are three basic steps in the design of a measurement for 

 characterization of explosion products in water. These are based 

 on the answers to the following questions: 



(a) Why are the measurements needed? or 

 "Objectives of Analysis" 



(b) What parameters should be sought? or 

 "Parameters of Analysis" 



(c) How should the measurement be made? or 

 "Method of Analysis" 



32 



