Table 5.

Results of paired t-tests for cross-border equivalency of means, and deviation from 1:1 relationship (all sample pairs separated by 5 km or less)

Low LOI (≤18.4%) cross border pairs (≤5 km, N = 234)High LOI (>18.4%) cross border pairs (≤5 km, N = 304)All cross border pairsAverageAverage
QuebecLabradorPaired t-testQuebecLabradorPaired t-test(≤5 km, N = 538)Diff as% Diff
Min% @ MinMin% @ Min(95% level)Min% @ MinMin% @ Min(95% level)Paired t-test (95% level)Ratiofrom 1:1
Ag0.0010.840.0190.84Fail (−0.195)0.0170.550.0531.1Fail (−0.204)Fail (−0.2; <0.001)0.6337
Al34000.8449000.84Pass (0.030)10000.5535000.55Fail (−0.058)Fail (−0.047; 0.001)0.9010
Ba21.20.8437.80.84Pass (0.042)13.60.5510.61.1Pass (0.009)Pass (0.022; 0.107)0.955
Be0.055.90.052.5Fail (−0.079)0.0560.055.5Fail (−0.055)Fail (−0.064; 0.002)0.8614
Ca11000.843000.84Fail (0.064)5000.554002.7Fail (0.059)Fail (0.061; <0.001)1.1515
Cd0.022.50.040.84Pass (0.068)0.111.60.160.55Fail (−0.061)Pass (0.010; 0.637)0.982
Ce21.80.8424.41.7Fail (−0.102)0.70.5516.20.55Fail (−0.096)Fail (−0.099; <0.001)0.8020
Co2.30.843.20.84Fail (−0.051)0.60.551.90.55Fail (−0.087)Fail (−0.073; <0.001)0.8515
Cr5.20.8411.62.5Pass (0.033)3.20.5570.55Fail (−0.041)Fail (−0.038; 0.007)0.928
Cs0.120.840.210.84Fail (−0.050)0.010.550.070.55Fail (−0.112)Fail (−0.088; <0.001)0.8218
Cu3.540.849.381.7Pass (0.048)7.930.556.760.55Pass (0.010)Pass (0.013; 0.419)0.973
Fe53000.8472000.84Pass (0.045)15000.5517000.55Fail (−0.094)Fail (−0.075; <0.001)0.8416
Ga1.50.851.70.84Pass (0.014)0.050.550.31.6Fail (−0.076)Fail (−0.515; 0.002)0.3169
Hg2.53.42.50.84Pass (0.018)420.55401.1Pass (0.021)Pass (0.006; 0.755)1.011
K5002.55002.5Pass (0.014)502.21001.6Fail (−0.053)Fall (−0.038; 0.046)0.928
La11.50.8412.61.7Fail (−0.086)0.250.558.20.55Fail (−0.073)Fail (−0.079; <0.001)0.8317
Li4.10.844.10.84Pass (0.014)0.052.20.80.55Pass (0.081)Pass (0.041; 0.074)0.919
Mg13000.8411000.84Pass (0.001)2000.554002.2Fail (−0.049)Pass (0.030; 0.070)0.937
Mn460.84540.84Pass (0.067)10.5551.1Fail (−0.192)Fail (−0.142; <0.001)0.7228
Mo0.110.840.310.84Pass (0.098)0.321.60.791.1Pass (0.056)Fail (−0.072; 0.008)0.8515
Na301.750.84Fail (0.048)50.5553.8Fail (0.091)Fail (0.074; <0.001)1.1919
Nb0.230.840.230.84Fail (0.066)0.030.550.161.6Fail (0.060)Fail (0.062; <0.001)1.1515
Ni40.846.21.7Fail (−0.044)5.50.554.50.55Pass (0.026)Fail (−0.033 0.014)0.937
P2200.842900.84Pass (0.001)2101.12801.1Fail (−0.073)Fail (−0.045; 0.004)0.9010
Pb1.440.842.042.6Pass (0.018)0.950.550.710.55Pass (0.014)Pass (0.001; 0.921)1.000
Rb3.30.843.51.7Pass (0.0004)0.050.550.70.55Fail (−0.066)Fail (−0.040; 0.048)0.919
S0.018.40.020.84Pass (0.078)0.050.550.12.7Pass (0.037)Pass (0.008; 0.741)0.982
Sc0.90.841.90.84Fail (−0.070)0.051.10.60.55Fail (−0.103)Fail (−0.090; <0.001)0.8119
Se0.058.40.050.84Pass (0.007)0.30.550.050.55Fail (0.134)Fail (0.084; <0.001)1.2121
Sn0.10.840.12.6Fail (0.052)0.05170.0522Pass (0.009)Pass (0.026; 0.142)1.066
Sr5.71.72.80.84Fail (0.032)4.80.552.90.55Fail (0.049)Fail (0.043; <0.001)1.1010
Th0.80.840.72.5Pass ( 0.017)0.0560.052.2Pass (0.043)Pass (0.0028; 0.920)1.011
Ti1200.841000.84Pass (0.017)10.55163.3Pass (0.051)Pass (0.024; 0.186)0.955
Tl0.042.50.051.7Fail (−0.057)0.013.30.020.55Fail (−0.053)Fail (−0.054; 0.003)0.8812
U0.30.840.40.84Pass (0.009)0.050.550.21.6Pass (0.0045)Pass (0.006; 0.765)0.991
V110.84151.7Fail (−0.038)12.730.55Fail (−0.113)Fail (−0.083; <0.001)0.8317
Y2.520.844.70.84Fail (−0.078)0.350.554.470.55Fail (−0.092)Fail (−0.087; <0.001)0.8218
Zn13.30.8432.30.84Fail (−0.053)10.5531.1Fail (−0.168)Fail (−0.123; <0.001)0.7525
Zr0.21.70.055Fail (0.334)0.050.550.052.7Fail (0.186)Fail (0.245; <0.001)1.7676

Results for all pairs that pass the paired t-test analyses are marked in bold. The numbers in brackets following the Pass or Fail indication is the average difference between the pairs in log10 units. The additional number for the all pairs column is the probability associated with the computed t estimate.

Elements where more than 10% of values were less than the detection limit are omitted.