Table 3. Mean (also minimum and maximum) of ratio of best values (BV, this lab) to recommended, consensus, or working values (RV, literature), with 95% confidence limits on ratios.

 

 

BV / RV

 

 

 

 

 

BV / RV

 

 

 

n

min

max

mean

95%

signif.

 

 

n

min

max

mean

95%

signif.

Na

24

0.972

1.014

1.001

0.004

 

 

La

23

0.906

1.016

0.990

0.011

 

K

2

0.957

0.997

0.977

 

 

Ce

23

0.915

1.090

0.998

0.017

 

Ca

14

0.950

1.037

1.006

0.015

 

 

Pr

16

0.889

1.026

0.954

0.020

X

Sc

21

0.870

1.074

0.976

0.021

X

 

Nd

19

0.890

1.015

0.967

0.014

X

Cr

20

0.675

1.051

0.955

0.047

 

 

Sm

24

0.944

1.055

1.000

0.011

 

Cr*

16

0.840

1.051

0.994

0.029

 

 

Eu

22

0.832

1.010

0.955

0.019

X

Fe

26

0.953

1.011

0.987

0.006

X

 

Gd

21

0.830

1.158

0.962

0.037

X

Co

21

0.965

1.154

1.033

0.022

X

 

Tb

18

0.895

1.033

0.959

0.019

X

Ni

7

1.000

1.055

1.025

0.021

X

 

Dy

21

0.931

1.129

1.040

0.023

X

Zn

5

0.991

1.080

1.029

0.041

 

 

Ho

10

0.918

1.078

1.036

0.033

X

As

3

0.988

1.043

1.013

0.070

 

 

Er

14

0.815

1.200

1.033

0.054

 

Se

2

0.921

1.143

1.032

 

 

Tm

10

0.929

1.077

0.979

0.035

 

Rb

24

0.918

1.080

0.997

0.015

 

 

Yb

19

0.900

1.065

0.990

0.020

 

Sr

20

0.936

1.045

1.014

0.012

X

 

Lu

13

0.904

1.075

0.964

0.029

X

Y

21

0.887

1.114

1.013

0.033

 

 

Hf

22

0.986

1.054

1.027

0.010

X

Zr

16

0.911

1.147

1.011

0.033

 

 

Ta

15

0.874

1.007

0.936

0.021

XX

Sb

11

0.907

1.016

0.962

0.022

X

 

W

3

0.895

1.077

1.010

0.248

 

Cs

17

0.922

1.060

1.001

0.017

 

 

Th

19

0.920

1.074

0.959

0.018

X

Ba

23

0.906

1.020

0.977

0.012

X

 

U

13

0.907

1.033

0.971

0.023

X

n = Number of geostandards compared.

X = The mean ratio is significantly different from unity, but within 5%.

XX = The mean ratio is significantly different from unity by more than 5%.

* Excludes geostandards with <15 g/g Cr for which RVs are suspected to be high; see text.

Italicized elements: best values are estimated from concentrations for other REE elements; see text.

Based on comparisons for AGV-1, BCR-1, G-2, GSP-1, PCC-1, BHVO-1, MAG-1, QLO-1, RGM-1, SCo-1, SDC-1, SGR-1, STM-1, AC-E, AN-G, BE-N, BR, DR-N, DT-N, FK-N, GA, GH, GS-N, MA-N, Mica-Fe, Mica-Mg, PM-S, UB-N, and WS-E (1214, 2629). Includes only high-precision data, i.e., those for which the confidence limits are <10% of the concentration values. There is an insufficient amount of high-precision data to make comparisons for Br, Ag, Cd, Ir, Au, and Hg.