ALKALİN VE ASİT TOPRAKLARDAN ALINAN NaHCO3 VE BRAY-2 EKSTRAKTLARINDA İKİ AYRI KOLOİMETRİK METODLA TAYİN EDİLEN FOSFOR Mİ.I{TARLARININ MUKAYESESİ ÜZERİNE BİR ARAŞTIRMA

Öz

ÖZET
Bu çalışmada; reaksiyonlarz farklı (Alka/in-Asiı) topraklardan
NaHC0 3 (0.5 M, pH=8.5) ve Bray-2 (0.1 N HCl +0.03 N NH4F)
çözeltileriyle ekstrakte edilmiş olan fosforun; molibdo-fosforik mavi
renk esasına göre iki ayıfosfor tayin metodu (HCl-Sn ve HıS04 - As
korbik asit) ile bulunan miktarlarz birbirıeri ile mukayese edilmiş, aralarandaki
ilgi derecesi hesaplanmış ve uygulaması daha basit ve seri
olan Sülfirik asit-Askorbik asit metodunun HCl-Sn metodu yerine
ikame edilme imkanı araştırılmıştır.
Netice olarak; adı geçen iki metod arasında NaHC0 3 ve Bray-2
ekstrakılarında % 1 seviyesinde önemli (r=0.976 ve r=0.998) müsbet
ilgi tesbit edilmiş ve Sülfirik asit-Askorbik asit metodunun kolorimetrik
fosfor tayininde HCl-Sn metodu yerine kullanılabileceği neticesine
varılmıştır.

An lnvestigation On The Applications Of Two Different Colorimetric Methods For Phosphorus Determination
Using NaHCO3 And Bray-2 Extracts From Alkaline And Acid Soil.

Using acid and alkali soils, we
have tasted two different colonmetric
methods for determining inorganic' phosphorus
in NaHCO 3 and Bray- 2
extracts.
The soils Wihch were used in this
experiment were coIlected from Erzincan
and Bayburt valiey alsa Rize Region.
Rize soils were acid, Erzincan
and Bayburt soils were alkaline in
reaction.
The Olsen's 0.5 M NaHCO3 at
pH 8.5 eqtraction meth~ct'were applied
to six Rize and six Bayburt soils while
ten surface soils each regions were
extracted according to the Bray- 2
(O. IN HCl + 0.03N NH4F)
Molybdophosphoric blue method
in hydrochloric acid system Jackson
(1958) and H ıS0 4- Ascorbic acid method
John (1970) have been used ın
all soil extracts.
it has been found that the both
colonmetric methods gave positif correlation
with the extractants at the level
of 1 %'
However there was no differences
between the values obtained by these
colorimetric methods but the H ıSO 4Ascorbic
acid procedure was simple
to operate and more reproducible.

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