Appendix Table 2.  Summaries of Total Alkalinity Data
                      for Certified Reference Materials

    Tables 2A to 2M summarize ALK measurements on water from bottles of 
Certified Reference Materials (CRM's) prepared in the laboratory of Dr. Andrew 
Dickson of SIO. These measurements in most cases were made on the same bottles
measured for DIC and reported in Table 1, but DO NOT constitute a certification 
of the 13 batches of CRM's. Natural sea water Batches 4 and 5 proved to be  
contaminated biologically. During solution of the contamination problem,  
Batches 6, 7 and later 11 were made of "artificial sea water", mixtures of
sodium bicarbonate in a sodium chloride solution matrix. With Batch 13, natural 
sea water batches stable for ALK were again produced. Several measurements 
made in 1993 on batch number 13 are not listed in Table 2M.  Complete results 
for CRM batch 13 will be presented in the next report. 

    Comments on each column in the table follow:

ANAL            The date of potentiometric titration of the CRM sample.
DATE

TITR            The titration system used to measure the ALK: G, the 
SYST            gravimetric system, and V, the volumetric system. 

SAMPLE          The number refers to the bottle number assigned by the Dickson
BOTTLE          laboratory: it corresponds to the order of filling of that
                bottle in its batch. The "P" and the following letter are 
                codes for SIO laboratory use.

TRIAL           This number refers to multiple titrations on the same CRM  
                bottle. In this table, all trials are given equal weight,
                meaning that all bottles of the batch are considered to
                contain the same water.

FLAG            Very bad results are flagged with "EX" and omitted from
                consideration in the calculation of averages.

INDIV           The individual ALK result for each titration trial.

AV(G)           The average ALK of all unflagged gravimetric titrator system
                measurements.

STDEV(G)        The sample standard deviation calculated from the gravimetric
                system results, along with the number of gravimetric trials
                averaged. No listing appears for batches 11 and 12 because only
                two gravimetric measurements were made.

AV(V)           The average ALK of all unflagged volumetric titrator system 
                measurements.

STDEV(V)        The sample standard deviation calculated from the volumetric
                system results, along with the number of volumetric trials
                averaged. No listing appears for batch 13 because only two
                unflagged volumetric measurements were made.