Mixed Analyte Performance Evaluation Program

Statistical Summary

 Sample Id:  MAPEP-96-S3
                               Grand     Std.   Reference    Acceptance
Analyte         T(1)    A(2)    Mean     Dev.     Value         Range         Units
Aluminum         37      37  15046.38  7473.07  19100.00 13370.00 - 24830.00 (mg/kg)
Arsenic          36      31     38.22     4.75     35.60    24.92 - 46.28    (mg/kg)
Barium           39      37    271.01    70.15    282.00   197.40 - 366.60   (mg/kg)
Cadmium          38      33      6.84     0.72      7.93     5.55 - 10.31    (mg/kg)
Calcium          37      37  64207.92  5545.19  68500.00 47950.00 - 89050.00 (mg/kg)
Chromium         39      33     46.26     9.82     48.90    34.23 - 63.57    (mg/kg)
Copper           36      28     17.13     1.90     15.90    11.13 - 20.67    (mg/kg)
Iron             37      33  17365.70  2145.98  18300.00 12810.00 - 23790.00 (mg/kg)
Lead             38      34     50.00     4.45     49.40    34.58 - 64.22    (mg/kg)
Magnesium        38      35   8880.52   917.42   9650.00  6755.00 - 12545.00 (mg/kg)
Manganese        37      37    266.74    30.95    286.00   200.20 - 371.80   (mg/kg)
Potassium        38      23   3771.52   567.44   4050.00  2835.00 - 5265.00  (mg/kg)
Selenium         33      24      7.45     1.06      6.90     4.83 - 8.97     (mg/kg)
Silver           37      34     34.06     3.16     32.50    22.75 - 42.45    (mg/kg)
Sodium           37      28    481.17    80.43    514.00   359.80 - 668.20   (mg/kg)
Vanadium         37      37     79.20    49.30     87.30    61.11 - 113.49   (mg/kg)
Zinc             36      33     70.19     8.37     69.50    48.65 - 90.35    (mg/kg)
Americium-241    42      37     26.43     2.83     28.70    20.09 - 37.31    (Bq/kg)
Cesium-137       43      43   1628.84   193.42   1531.00  1071.70 - 1990.30  (Bq/kg)
Cobalt-60        45      43    832.86    83.50    812.00   568.40 - 1055.60  (Bq/kg)
Plutonium-238    37      33     16.14     1.77     15.90    11.13 - 20.67    (Bq/kg)
Plutonium239/240 38      35     19.95     1.96     19.70    13.70 - 25.61    (Bq/kg)
Strontium-90     27      22    490.01    57.11    536.00   375.20 - 696.80   (Bq/kg)
Uranium-234/233  35      28     61.34     7.27     63.90    44.73 - 83.07    (Bq/kg)
Uranium-238      39      31     63.53     6.36     64.00    44.80 - 83.20    (Bq/kg)
alpha-BHC        23      20    186.68    29.07    179.60   125.72 - 233.48   (uq/kg)
delta-BHC        23      18     80.60     8.54     79.00    55.30 - 102.70   (uq/kg)
Aldrin           23      18    135.72    14.60    137.50    96.25 - 178.75   (uq/kg)
4,4'-DDE         22      17     41.92     6.29     40.00    28.00 - 52.00    (uq/kg)
Dieldrin         23      20    105.58    15.85     97.50    68.25 - 126.75   (uq/kg)
Endosulfan-II    23      21     41.55     5.56     42.90    30.03 - 55.77    (uq/kg)
Endrin Aldehyde  22      11     80.39    10.90     89.70    62.79 - 116.61   (uq/kg)
Methoxychlor     13      13     15.28     5.88     42.10    29.47 - 54.73    (uq/kg)

NOTE:  1) The variability of the Aluminum and Vanadium results in study 96S3 exceeded
        'typical' confidence intervals and thus all laboratoies reporting these
        analytes have been graded 'Acceptable'.

       2) Methoxyclor was correctly identified by only approximately 50% of the labs
        performing pesticides analysis and was reported at levels significantly below
        spiked levels.  For this reason, all laboratoies reporting this analyte have
        been graded 'Acceptable'.

       


Outliers are excluded from the statistical summary.        
Outliers are defined as laboratory data with a bias greater than 30 percent.
(1) T = Total number of Laboratories Reporting Analyte
(2) A = Number of Laboratories with 'Acceptable' Performance.
      Excludes laboratory inorganic data catagorized as Total analyte.

10/22/96                               Page 1