Determinación de nitratos en vegetales
A number of methods have been devised for the determination of nitrates in plant tissue, but no unanimous agreement has been reached as to which is the most satisfactory. This paper looks at four such methods of plant tissue analysis and seeks to establish correlations among them and set guidelines...
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| Publicado en: | Revista de la Facultad de Ciencias Agrarias |
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| Autores principales: | , , , |
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| Acceso en línea: | https://bdigital.uncu.edu.ar/fichas.php?idobjeto=153 |
| descriptores_str_mv |
Analytic methods Datos estadísticos Lechugas Mendoza (Argentina) Mercado Cooperativo de Guaymallén Métodos analíticos Nitrates Nitratos Técnicas analíticas Vegetales |
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| todos_str_mv |
149 78 spa UNCuyo FCA Dto. Ingenieria Agricola UNCuyo FCA Dto. Ingenieria Agricola UNCuyo FCA Dto. Ingenieria Agricola UNCuyo FCA Dto. Ingenieria Agricola |
| description_str_mv |
A number of methods have been devised for the determination of nitrates in plant tissue, but no unanimous agreement has been reached as to which is the most satisfactory. This paper looks at four such methods of plant tissue analysis and seeks to establish correlations among them and set guidelines for their selection and applicability. A total of 690 samples for iceberg an butterhead lettuce (Lactuca sativa L. var. capitata) were collected within a one year period at the Mercado Cooperativo de Guaymallén (Mendoza, Argentina). According to the tenors of NO3 - found in the entirety of the studied population, a proportional stratified random sub-sampling was made in order to obtain a number of samples that would represent total population variability.
Four methods were used in the determination of nitrates:
1. the steam distillation method, taken as reference method
2. the colorimetric method, for nitration with salicylic acid
3. the modified colorimetric method.
4. the potentiometric method, with ion selective electrode
Different regression models were used in evaluating the correlation between the reference and the other methods, with the result that being the lineal model the one better suited to all cases. The biggest correlation (r2 = 93 %) existed between the distillation and potentiometric methods. Nevertheless the remaining methods also presented high correlation. Method selection will depend mainly on the number of samples to be analyzed, the required analysis time and the cost.
Para la cuantificación de nitratos hay numerosas técnicas y no existe entre los analistas unanimidad en la selección de la más adecuada. Por tal motivo, se compararon cuatro métodos para la determinación de nitratos en muestras vegetales con el fin de evaluar la correlación entre los mismos y establecer pautas para su utilización. Se utilizaron 690 muestras de lechuga (Lactuca sativa L. var. capitata), pertenecientes a los tipos arrepollado y mantecoso, recolectadas a lo largo de un año en el Mercado Cooperativo de Guaymallén (Mendoza, Argentina). Según los tenores de nitratos encontrados en la población estudiada se efectuó un sub-muestreo aleatorio estratificado proporcional para lograr un número de muestras que representaran la variabilidad del total de la población. Se utilizaron cuatro métodos para la determinación de nitratos: 1. destilación por arrastre con vapor, considerado como método de referencia 2. colorimetría por nitración con ácido salicílico 3. colorimetría modificada 4. potenciometría con electrodo selectivo Se probaron diferentes modelos de regresión entre el método de referencia y los otros tres, siendo el lineal el que mejor se ajustó en todos los casos. Los métodos estudiados tuvieron comportamiento semejante. La mayor correlación (r2 = 93 %) se observó entre la destilación por arrastre con vapor y la potenciometría; no obstante, los restantes también presentaron alta correlación. Consecuentemente, la elección del procedimiento analítico dependerá principalmente del número de muestras a analizar, del tiempo requerido por el análisis y del costo del mismo. |
| disciplina_str_mv |
Ciencias agrarias |
| titulo_str_mv |
Determinación de nitratos en vegetales Determination of nitrates in vegetables |
| autor_str_mv |
Filippini, María Flavia Martí, Luis Salcedo, Carlos Valdés, Analía |
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Textual: Revistas |
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153 |
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Artículo de Revista |
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article |
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Revista de la Facultad de Ciencias Agrarias |
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Revista de la Facultad de Ciencias Agrarias |
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r-78 |
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Revista de la Facultad de Ciencias Agrarias |
| container_volume |
Vol. 36, no. 1 |
| journal_issue_str |
Vol. 36, no. 1 |
| tipo_str |
textuales |
| type_str_mv |
Articulos |
| title_full |
Determinación de nitratos en vegetales |
| title_fullStr |
Determinación de nitratos en vegetales Determinación de nitratos en vegetales |
| title_full_unstemmed |
Determinación de nitratos en vegetales Determinación de nitratos en vegetales |
| description |
A number of methods have been devised for the determination of nitrates in plant tissue, but no unanimous agreement has been reached as to which is the most satisfactory. This paper looks at four such methods of plant tissue analysis and seeks to establish correlations among them and set guidelines for their selection and applicability. A total of 690 samples for iceberg an butterhead lettuce (Lactuca sativa L. var. capitata) were collected within a one year period at the Mercado Cooperativo de Guaymallén (Mendoza, Argentina). According to the tenors of NO3 - found in the entirety of the studied population, a proportional stratified random sub-sampling was made in order to obtain a number of samples that would represent total population variability.
Four methods were used in the determination of nitrates:
1. the steam distillation method, taken as reference method
2. the colorimetric method, for nitration with salicylic acid
3. the modified colorimetric method.
4. the potentiometric method, with ion selective electrode
Different regression models were used in evaluating the correlation between the reference and the other methods, with the result that being the lineal model the one better suited to all cases. The biggest correlation (r2 = 93 %) existed between the distillation and potentiometric methods. Nevertheless the remaining methods also presented high correlation. Method selection will depend mainly on the number of samples to be analyzed, the required analysis time and the cost.
|
| dependencia_str_mv |
Facultad de Ciencias Agrarias |
| title |
Determinación de nitratos en vegetales |
| spellingShingle |
Determinación de nitratos en vegetales Analytic methods Datos estadísticos Lechugas Mendoza (Argentina) Mercado Cooperativo de Guaymallén Métodos analíticos Nitrates Nitratos Técnicas analíticas Vegetales Filippini, María Flavia Martí, Luis Salcedo, Carlos Valdés, Analía |
| topic |
Analytic methods Datos estadísticos Lechugas Mendoza (Argentina) Mercado Cooperativo de Guaymallén Métodos analíticos Nitrates Nitratos Técnicas analíticas Vegetales |
| topic_facet |
Analytic methods Datos estadísticos Lechugas Mendoza (Argentina) Mercado Cooperativo de Guaymallén Métodos analíticos Nitrates Nitratos Técnicas analíticas Vegetales |
| author |
Filippini, María Flavia Martí, Luis Salcedo, Carlos Valdés, Analía |
| author_facet |
Filippini, María Flavia Martí, Luis Salcedo, Carlos Valdés, Analía |
| title_sort |
Determinación de nitratos en vegetales |
| title_short |
Determinación de nitratos en vegetales |
| url |
https://bdigital.uncu.edu.ar/fichas.php?idobjeto=153 |
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3 |
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Biblioteca Digital |
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Biblioteca Digital |
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Artículo de Revista |
| institution |
Sistema Integrado de Documentación |
| indexed_str |
2023-04-25 00:39 |
| _version_ |
1764120374414409728 |
