Cadmium contamination in soils under rice cultivation

Mohd. Khanif Yusop, . and Betie A., . (1998) Cadmium contamination in soils under rice cultivation. [Proceedings Paper]

In recent years there has been an increasing concern over cadmium cd in the environment because of its highly toxic to human. Cadmium in soils can be removed by edible plants and it represents a direct pathway for its incorporation into the human food chain. A study was conducted to evaluate Cd in the rice growing area. The study also investigated the relationship between total Cd in the soil and its uptake by rice grain. In this study soil sample 0-15 cm were collected from the MUDA Irrigation Scheme in Kedah and Perlis. Ten soil series were collected Kuala Kedah Kuala Perlis Tualang Chengal Kundor Guar Kangkung Tebengau Rotan and Sedaka. In the five soil series Kuala Perlis Kuala Kedah Sedaka Tebengau and Guar Cd in the soils sampled at 0-5 cm 5-10 cm 10-15cm 15-20cm 20cm-25 cm 25-30 cm 30-35 cm 35-40 cm and 40-45 cm depth was analysed. The Cd contents in the soils were extracted with HC1 HNO subscript 3 at 3:1 v/v aqua-regia. The soils were sampled during land preparation after planting and after harvesting. The Cd 60 samples with 6 replication for 10 series in rice grain was extracted with 20 HNO subscript 3. All the extracts were analysed for Cd using an atomic absorption spectrophotometer. Our results indicated that Cd in the soils varied with different sampling time except the Rotan and Guar series. The highest concentration of Cd in the soil was found in the Kuala Kedah series. The concentration of total Cd in the soils was 0.747-0.561 lambda g/g. However these values were below the Maximum Permitted Concentration MPC currently found in some developed countries. The results also showed that the Cd content was the highest in the topsoils 0-30 cm. The levels decrease with soil depth. Total Cd in the soils was significantly correlated with the Cd in the grains r square 0.75 if data from Kuala Kedah soil was not taken into account. The Cd content in the grains was 0.030-0.024 lambda g/g. These values were below the Australia MPC of 0.05 lambda g/g. The results indicated that the current practices in rice production increase Cd contamination both in soils and rice grains.

Full text available from:

Abstract

In recent years there has been an increasing concern over cadmium cd in the environment because of its highly toxic to human. Cadmium in soils can be removed by edible plants and it represents a direct pathway for its incorporation into the human food chain. A study was conducted to evaluate Cd in the rice growing area. The study also investigated the relationship between total Cd in the soil and its uptake by rice grain. In this study soil sample 0-15 cm were collected from the MUDA Irrigation Scheme in Kedah and Perlis. Ten soil series were collected Kuala Kedah Kuala Perlis Tualang Chengal Kundor Guar Kangkung Tebengau Rotan and Sedaka. In the five soil series Kuala Perlis Kuala Kedah Sedaka Tebengau and Guar Cd in the soils sampled at 0-5 cm 5-10 cm 10-15cm 15-20cm 20cm-25 cm 25-30 cm 30-35 cm 35-40 cm and 40-45 cm depth was analysed. The Cd contents in the soils were extracted with HC1 HNO subscript 3 at 3:1 v/v aqua-regia. The soils were sampled during land preparation after planting and after harvesting. The Cd 60 samples with 6 replication for 10 series in rice grain was extracted with 20 HNO subscript 3. All the extracts were analysed for Cd using an atomic absorption spectrophotometer. Our results indicated that Cd in the soils varied with different sampling time except the Rotan and Guar series. The highest concentration of Cd in the soil was found in the Kuala Kedah series. The concentration of total Cd in the soils was 0.747-0.561 lambda g/g. However these values were below the Maximum Permitted Concentration MPC currently found in some developed countries. The results also showed that the Cd content was the highest in the topsoils 0-30 cm. The levels decrease with soil depth. Total Cd in the soils was significantly correlated with the Cd in the grains r square 0.75 if data from Kuala Kedah soil was not taken into account. The Cd content in the grains was 0.030-0.024 lambda g/g. These values were below the Australia MPC of 0.05 lambda g/g. The results indicated that the current practices in rice production increase Cd contamination both in soils and rice grains.

[error in script]

Item Type:	Proceedings Paper
AGROVOC Term:	PADDY SOIL
AGROVOC Term:	PLANT TISSUES
AGROVOC Term:	ATOMIC ABSORPTION SPECTROMETRY
AGROVOC Term:	CADMIUM
AGROVOC Term:	CONTAMINATION
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16223

Actions (login required)

View Item