SECTION 3,
continued
43
3.2.6
Formulating Formazin Stock Solution
DANGER
To familiarize yourself with
handling precautions, dangers and
emergency procedures, always
review the Material Safety Data
Sheets prior to handling
containers, reservoirs, and delivery
systems that contain chemical
reagents and standards.
Protective eye wear always is
recommended when contact with
chemicals is possible.
DANGER
Pour se familiariser avec les précautions à prendre lors de la manipulation, les dangers
et les procédures d'urgence, toujours lire les Fiches de Données de Sécurite avant de
manipuler les récipients, les réservoirs et les systèmes de distribution contenant les
réactifs chimiques et les solutions éta-lons. Il est toujours recommondé de porter des
lunettes de protection lorsq’un contact avec les produits chimiques est possible.
PELIGRO
Para familiarizarse con las precauciones de manipulación, los peligros y los
procedimientos de emergencia, siempre estudie las Hojas de Datos de Seguridad de los
Materiales antes de manipular recipientes, depósitos y sistemas de entrega que
contengan reactivos y patrones químicos. Siempre se recomienda el uso de protectores
oculares cuando sea posible el contacto con productos químicos.
GEFAHR
Es wird dringend empfohlen, die Sicherheitsdatenblätter vor der Handhabung von
Behältern, Tanks und Zufuhrsystemen, die chemische Reagenzien und
Standardsubstanzen enthalten, aufmerksam durchzulesen, damit Sie sich mit den beim
Umgang mit diesen Chemikalien notwendigen Vorsichtsmaßnahmen, Risiken und
Notfallschutzmaß-nahmen vertraut machen. Es wird empfohlen, in allen Situationen,
in denen mit einem Kontakt von Chemikalien zu rechnen ist, eine Schutzbrille
zu tragen.
PERIGO
Para familiarizar-se com as precauções de manipulação, riscos e procedimentos de
emergência, examine sempre o Folheto de Dados de Segurança antes de manipular os
recipientes, tanques e sistemas de distribuição que contenham reagentes químicos e
outros elementos padronizados. Se recomenda sempre o uso de protetores para olhos,
quando possa acontecer contato com os produtos químicos.
Note: Preparing Formazin from raw
materials is not recommended.
Preparation is temperature and
technique sensitive. Use prepared
4000 NTU Formazin stock solution
to avoid handling raw materials, and
for best instrument performance and
assured analytical accuracy.
Synthesize a 4000-NTU Formazin stock solution for making the calibration
standard dilutions as follows (in place of using the prepared stock solution):
1. Dissolve 5.000 grams of reagent grade hydrazine sulfate (N
2
H
4
•
H
2
SO
4
)
in
approximately 400 mL of deionzed water.
2. Dissolve 50.000 grams of reagent grade hexa-methylenetetramine in
approximately 400 mL of deionzed water.
3. Quantitatively, pour the two solutions into a 1-liter volumetric flask, and
dilute to volume with deionzed water. Mix well.
4. Allow the solution to stand for 24 hours at 25 ±3
°
C (77 ±5
°
F). The
suspension develops during this time.
Tài liệu sưu tầm của Trung Sơn - www.tschem.com.vn - 028.3811.9991 - [email protected]
Tài liệu sưu tầm của Trung Sơn - www.tschem.com.vn - 028.3811.9991 - [email protected]
