Table 1: Comparison of mean values (M ± SEM) trace element concentrations (mg/L, wet mass basis) in the non-hyperplastic prostate gland of males between ages 21-87 years obtained by both INAA-LLR and ICP-MS methods.

Element

NAA-LLR (M1)

ICP-MS (M2)

∆ (%)

Student’s t-test

Ag

0.0117 ± 0.0015

0.0081 ± 0.0010

30.8

N.S.

As

< 0.02

≤  0.0040

-

-

Au

< 0.003

0.00085 ± 0.00013

-

-

Br

 

5.88 ± 0.62

-

-

Co

0.00784 ± 0.00061

0.00773 ± 0.00077

1.4

N.S.

Cr

0.095 ± 0.010

0.105 ± 0.011

-10.5

N.S.

Cs

< 0.01

0.00691 ± 0.00040

-

-

Eu

< 0.0003

≤  0.00011

-

-

Gd

< 0.04

0.00055 ± 0.00007

-

-

Hf

< 0.02

≤  0.0039

-

-

Hg

0.0088 ± 0.0012

0.0097 ± 0.0013

-10.2

N.S.

Rb

2.52 ± 0.32

3.24 ± 0.14

-28.6

N.S.

Sb

0.0102 ± 0.0015

0.0071 ± 0.0007

30.4

N.S.

Se

0.136 ± 0.010

0.160 ± 0.007

-17.6

N.S.

Sm

< 0.002

0.00050 ± 0.00006

-

-

Ta

< 0.02

≤  0.0011

-

-

Tb

< 0.005

0.000074 ± 0.000011

-

-

Th

< 0.01

0.00055 ± 0.00010

-

-

U

< 0.01

0.00105 ± 0.00026

-

-

Yb

< 0.005

0.00029 ± 0.00005

-

-

Zn

164 ± 14

173 ± 19

-5.5

N.S.

Zr

< 0.2

0.0080 ± 0.0014

-

-

 

M: Arithmetic Mean, SEM: Standard Error of Mean, “<” detection limit of method, “≤” the possible upper limit of the mean (see text), ∆ = [(M1 - M2)/M1]. 100%, N.S: Not Significant