
1/14/2012
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Why bottle samples do not always
ma
tch CTD data
• Tracking sensor accuracy is goal
• Problems can arise
– Position of Niskin bottle on frame with respect to
sensors or intake of plumbing
– Rinsing of Niskin bottles and thermal mass
– Hold time at depth of bottle firing
– Leaky Niskin bottles
– Ti
me of water sample draw and order of draw on deck
• Always take DO first!
– Analysis errors (replicates, blanks, standards tracking,
dirty bottles, etc.)
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