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BÀI GIẢNG HÓA PHÂN TÍCH TS. GVC. HOÀNG THỊ HUỆ AN

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Giải :<br />

Đây là pp thêm Dùng công thức :<br />

Nồng độ thêm :<br />

C<br />

x<br />

=<br />

A<br />

0<br />

A<br />

−<br />

x<br />

A<br />

x<br />

⋅∆C<br />

x<br />

1.1560<br />

∆ C x<br />

= = 62 , 4<br />

25<br />

ppb<br />

Nồng độ Pb 2+ trong mẫu đo :<br />

Ax<br />

0,193<br />

C<br />

x<br />

= ⋅ ∆C<br />

x<br />

=<br />

.62,4 = 53, 29<br />

A − A 0,419 − 0,193<br />

0<br />

x<br />

ppb<br />

Nồng độ Pb 2+ trong mẫu nước biển :<br />

53 ,29 .25<br />

C<br />

( pt )<br />

= = 266 , 45<br />

5<br />

ppb

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