1 Analytical chemistry-Le Hoang Sinh PhD

i cng v phn tch khi lng

Chng 2-1

2 Analytical chemistry-Le Hoang Sinh PhD

Cc dng c & thit b

Cn phn tch (analytical scale) H thng lc p sut km (low vacuum filtering system)

T sy chn khng (vacuum oven) L nung (furnace)

3 Analytical chemistry-Le Hoang Sinh PhD

Cn mu

Cn phn tch (analytical scale) Giy cn (weighing paper) Thuyn cn (weighing boat)

o Cn phn tch c th c c 4 ch s sau du phy ( sai s 0.01-0.02 mg)

o Cc bc cn mu:

t giy cn/thuyn cn ln cn, a cn v v tr 0 (tare)

Chuyn mu cn thn vo giy cn/thuyn cn

ng ca ca bung cn

i cho cn n nh (ch s trn cn khng thay i)

Ghi li ch s khi lng ca mu

4 Analytical chemistry-Le Hoang Sinh PhD

K thut lc

Lc chn khng

Phu lc (filtering funnel)

Lc thng

Giy lc (filtering paper)

Cch xp giy lc

5 Analytical chemistry-Le Hoang Sinh PhD

K thut sy v nung mu

T sy chn khng (vacuum oven)

Khong nhit : RT-300 oC

Mc ch: Loi dung mi v nc

L nung (furnace)

Khong nhit : RT-1800 oC

Mc ch: t chy v lm bay hi cc hp

cht d chy (trong ha phn tch c th t

chy giy lc)

6 Analytical chemistry-Le Hoang Sinh PhD

Cc phng php phn tch khi lng

Phng php tch/y

Phng php kt ta

Phng php in phn

Phng php chng ct

7 Analytical chemistry-Le Hoang Sinh PhD

Phng php phn tch kt ta

1. Cn mu & ha tan mu 2. Kt ta mu 3. Lc & ra kt ta

4. Sy sn phm 5. Cn sn phm 6. Tnh ton