US Long-Term Ecological Research Network
Code Definition
A :

Sample suspect

B :

Standard curve/reduction suspect

C :

No sample taken

D :

Sample lost

E :

Average of duplicate analyses

F :

Duplicate analyses in error

G :

Analysed late

H :

Outside of standard range

I :

Outside of data entry constraints

J :

Non standard routine followed

K :

Data suspect

L :

Data point and blind value differ by more than 15%

M :

More than t

N :

Sample retested

O :

Value suspect but total pigment(CHL + PHAEO) value accurate

P :

TPM uncorrected for humidity change between filter weighing

Q :

Quality control comments on SLOH lab sheet

R :

Value between LOD and LOQ

S :

Value below detection limit; set to zero

T :

Sample contaminated; data not reported

U :

Equipment malfunction produced bad value; value set to missing;

V :

Could not be computed; set to missing

W :

negative light value; set to zero