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Ref. No.: ISOfa 511 - W&C id (E)
UDC 6a1.622
I NT ERN AT I O PI AL O RG A iU 12 AT I O N FOR §TA ND AR D I2 AT I ON
1st EDITION
October 1960
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore oniy
by the national standards organization of that country, being
a member of ISO.
For each individual couniry the onIy valid standard is the national standard of that country.
Printed in Swiîzerland
Also issued h French ahd Russian. Copies to be obtained through the national standards organizations.
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r,
I----+--
&
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7
--.--J
- <-
..
y--, <-
4 lead carbonateland
Suni of ~
lead hydroxide min.
b v
Matter volatilc at 105 OC, max.
Matter soluble in water, max.
I'
V
0,2 mi of 0,l N acid solution
Alkalinity of aqueous extract,max.
l_l__ -- . -
5i5nigs
,/ P
Residue on sieve, maK. e
1
9 6 For p-iniing buildjnp ivtcriors the U%ik Lrad (Painting) Convention. 193 WO. 13) Of the International Labour
Organization prohibits the use cf white lead and pf all products containing it. except where the use CC white lead is
considerkd necessary for railway stations or industrial establishments by :bc competent authority. after consultation
with the eniploycrs' and workers' orsanizations concerned.
.-
2) 4A Ail pcrcentagcs are calculated from the original sample. : . .
. 1. _. ._ __., :- . . . . ._. : . . . -
.
*e
Two alternative methods forketc.rr.iin3:ion of residue on siive aie rcconnecdcd in i SC$%+
3)
idcntifkd respxîivdy 2s rhz" oil m-[hod "Ymd th- '' water methocl -not!, methods zrc acicp:3bi: for the purpose
of this#- ea but it is rccomm-nd:d that the n:sihod ta he used in a partic111ar cxi3 should 5,: spccifxri
in the :oftract or othmvisr ~yrc.4 between tne/partics and shoiild in any C~SC bc mcationed iii the Icst report.
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I
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77
A representative saniple of the pigment sr&&-bc taken in accordance with IS0
5 .I
-.-
%e nteicrted. p rtii-5,
S .2 The sample agreed between ' , to rihich reference is made in thab1 comply
with all the requirements spxified for the pigment iinder test.
..7
hITTHODS OF TUT -
dioxide (CO3 csntcnt.
4 I. 1.4 Afagnesiunt perchIornte,~nltl,~rorrs.
(5. I. I .S indicating soda lime. or soda asbestos.
. . -
.. . .. .
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I
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Boiling ffask with round bottom and short neck, nominal capacity 250 ml.
A
3 Short reflux condcnser.
I'
Stoppered dropping funnel.
c
\I
Y.
(& 1.1.3).
Wash-bottle containing potassium hydroxide solution
n
\ -- I
E
Washing vessel containing sulphuric ecid,(l. /./,2),~ /
U-tube containing a g1:isçivool plug to trzp spray and filled with anhydrous magnesium
F
perch~orate,/ 6 1 ' "1.
II Two ground&iass$topprred U-tubes filled with indicating soda Iime or soda asbestos$.// 9
G an1
(size 1,4 ta 3, m ) in I\ fiF3 two-thirds ofz$xe, and anhydrous magnesium perchlorateb I././ 5
in thc scrnaininç space (at the side where the gas stream passes out).
Indicating bubble counter containing concmtrated sulphuric acid (6,'. /-a)*
J
's-
(Alternatively, a third IJ-tube îillcd nith anhydrous magnesium perchlorate in \rst
third ef$$Tcc and soda asbestos in the remaining two-thirds may be iised.)
L Stream of air.
The absorption tubes E to J, as well as the other components of the apps-
ratus, need not necessarily be of the form illutratcd in thc figure.
Q 1.3 Procel?lrre_
Weigh,to the nearest 1 niz, 0,5 to 1,O g of Lvhite lead,@ into the flask
'
of water in the flask and rissenihie the apparatus, as shown in thc
tlic water on in the condcnscr B and draw air through the appratiis for 15 min.
Liosc the taps in the absorption tubes G and H and reniove the tubes. Wpc the
tubes with a clean cloth and allow them to remain in the balance case for 30 min. IJse a
similar U-tube as a counterpoise and before weighing open all the taps momentarily to
equalize the internal pressure. Reconnect the tubes to the apparatus after weiçhing. Pour
50 mi of the nitric acidinto the dropping funnel C and allow it to run gradually into
.i./.i)i
thc flask A until the funcd is almost empty.
When the reaction has subsided, heat the Bask, regulating the heat to give a steady flow
through the washing vessel E. Allow the contents of the flask to boil slowly, aspirating
a slow stream of air for a few minutes. Remove the source of heat and draw air through
(3 the apparatus at the rzte of twozthree bubbles per second for a further 20 min. Then,
. . . . I . .
close the taps of the absorption tubes, disconnect the tubes and weigh them, using the
same proccdure as for the first weighing.
@ntt-t, 6,
$Le Jead carbonate (PbCO$l\of white lead &$,-&-as a percentage by
by the following formula:
m7,4 aid
a e-
-
E$ -. . . .
..
where .
!r$'+ increase in ma&f the absorption tubcd;,in gram+) .:
I:. nie
r&$ mass$ grams'l 5 of the test po r t ;on.
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*’ I
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of total &id content by the chromate method2*
...