NIC-600-2233-06
4
Pretreatment of sample boat
Sample boats absorb mercury in the air and a blank becomes high. In order to measure with
sufficient accuracy, heat-treat to remove mercury sample boats before measurement.
The way of heat-treatment
(a) Sample boats are repeatedly and measured on MA-3000 to confirm low enough.
(b) Sample boats are put into a ceramic crucible, which is heated at 750 degrees for 1 hour or more.
*At first use,
don’t wash the sample boats before heat treatment. Performance may be impaired.
5. Setting for Measurement Condition
(
１
)
Click and “Measurement Condition” is displayed.
Select the proper method for “STD.” The default
method is already set for standard solution, but
selects the proper method for using SRM (Standard
Reference Materials).
Select
“Flow rate”.
0.1L /min: High sensitivity
(1pg~10ng)
0.2L/min: usual
0.5L/min: high concentration
(Linear range up to 10,000ng)
Enter the proper values in each item of “STD Check.”
In thermal decomposition mercury analyzing, approx
1% of the prior measured value is detected as a
carryover. If a low-concentration sample is measured
after a high concentration sample, it will be affected
with previous carryover.
“Blank Check” function provides to automatically lower
a blank.
Please refer this table which number should be
entered.
Typical value (0.2L/min)
ABS(LOW)
ABS(HIGH)
0.1ng
0.002
10ng
0.001
1ng
0.02
100ng
0.01
5ng
0.1
1,000ng
0.1
10ng
0.2
5,000ng
0.4
20ng
0.3
10,000ng
0.6
