Rapid Method for Determination of Phosphine Residues in Wheat

Longobardi, Francesco; Pascale, Michelangelo; Silvestri, Marco; Visconti, Angelo

doi:10.1007/s12161-008-9019-2

Cited by 7 publications

(3 citation statements)

References 11 publications

(22 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of analytical methods for the determination of phosphine were published, reviewed by Desmarchelier and Ren . Because of the volatility of the analyte, headspace sampling over the acidified sample is a convenient analytical approach. , Gas chromatography (GC) with flame photometric (FPD), mass spectrometric (MS), or thermoionic (NPD) detection allows a specific and sensitive determination. − Older methods rely on derivatization of PH 3 or its reaction products followed by titrimetric or photometric detection, for example, the method by Bruce et al Extraction, quantitation, and matrix effects are critical aspects of each method and can strongly influence the analytical result . The method of the Swiss Food Manual refers to a published method, but validation data is lacking.…”

Section: Introductionmentioning

confidence: 99%

Determination of Phosphine in Plant Materials: Method Optimization and Validation in Interlaboratory Comparison Tests

Amrein¹,

Ringier²,

Amstein³

et al. 2014

J. Agric. Food Chem.

View full text Add to dashboard Cite

The optimization and validation of a method for the determination of phosphine in plant materials are described. The method is based on headspace sampling over the sample heated in 5% sulfuric acid. Critical factors such as sample amount, equilibration conditions, method of quantitation, and matrix effects are discussed, and validation data are presented. Grinding of coarse samples does not lead to lower results and is a prerequisite for standard addition experiments, which present the most reliable approach for quantitation because of notable matrix effects. Two interlaboratory comparisons showed that results varied considerably and that an uncertainty of measurement of about 50% has to be assessed. Flame photometric and mass spectrometric detection gave similar results. The proposed method is well reproducible within one laboratory, and results from the authors' laboratories using different injection and detection techniques are very close to each other. The considerable variation in the interlaboratory comparison shows that this analysis is still challenging in practice and further proficiency testing is needed.

show abstract

Section: Introductionmentioning

confidence: 99%

Determination of Phosphine in Plant Materials: Method Optimization and Validation in Interlaboratory Comparison Tests

Amrein¹,

Ringier²,

Amstein³

et al. 2014

J. Agric. Food Chem.

View full text Add to dashboard Cite

show abstract

“…But gas chromatography with flame ionization detector was successfully employed for ultra trace level of phosphine with good limit of detection (0.01 ng ml −1 ), and its response is linear over the ranges 0.1-1.0 ng ml −1 (Chugtai et al 1998). Recently UV/visible spectrophotometric method is considered to be more attractive because of its low cost of analysis, convenience, and its high sensitivity toward phosphine ((Longobardi et al 2008;Rangaswamy 1984;Rangaswamy 1990;Rangaswamy and Muthu 1985).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Factors Affecting the Phosphine Residue in the Fumigation–Aeration Process of Stored Wheat Using Orthogonal Array Design

Khanchi¹,

Moein

Mansoubi

et al. 2009

Food Anal. Methods

View full text Add to dashboard Cite

Factors that affect the phosphine residue in the fumigation-aeration process were studied. Simulated experiments were carried out on the samples in nine different conditions (nine treatments using L 9 orthogonal array on four factors: amount of aluminum phosphide, fumigation time, aeration time, and fumigation temperature). The extracted phosphine residue of grains was quantified by UV/visible spectrophotometry at 410 nm. The results revealed that the most important factors are the aeration and fumigation time. The fumigation temperature has negligible effect on the phosphine residue, and there is no significant effect from the amount of aluminum phosphide. Under optimum conditions, the phosphine residue content was 0.0067 mg/kg of wheat grain, which is very less than the reported amounts by related organizations.

show abstract

“…On the other hand, toluene is used to absorb the PH 3 with average recoveries of 50-110% (Corley et al 1998). A rapid method for spectrophotometric determination of PH 3 residues in wheat was also reported (Visconti et al 2006;Longobardi et al 2008).…”

mentioning

confidence: 99%

Residue Dynamics Studies of Aluminum Phosphide and Magnesium Phosphide in Stored Rice Utilizing a Sulfuric Acid‐Toluene Extraction Coupled with Gas Chromatography Analysis

et al. 2011

View full text Add to dashboard Cite

Cereal Chem. 88(5):441-444A method for determination of aluminum phosphide and magnesium phosphide residues in rice was developed and validated. This work, through good laboratory practices, demonstrated aluminum and magnesium phosphide residue dynamics in stored rice. Rice samples were treated with sulfuric acid, which hydrolyzed phosphides to phosphine (PH 3 ), which was simultaneously trapped in toluene. The organic layer was filtered and then analyzed by gas chromatography with a flame photometric detector. The PH 3 calibration curves showed a strong linear relationship in the range of 0.012-1.2 mg/L, with a correlation coefficient of 0.999. The limit of detection of this method was 0.004 mg/kg. The average recoveries from samples fortified with aluminum phosphide and magnesium phosphide ranged from 76.8 to 106.5% with relative standard deviations below 10.2% (n = 5). PH 3 was applied separately to rice samples to study dissipation dynamics at application dosages of 9.0 and 12 g/m 3 , respectively. The results showed half-lives of aluminum and magnesium phosphide in rice to be 1.84 and 1.53 days, respectively. PH 3 was applied once at low and high dosages. The low dosage was 4.5 g/m 3 of aluminum phosphide and 6.0 g/m 3 of magnesium phosphide, and the high dosage was 9.0 and 12 g/m 3 for these two formulations, respectively. The final PH 3 residues were below 0.013 mg/kg (limit of quantification).

show abstract

Rapid Method for Determination of Phosphine Residues in Wheat

Cited by 7 publications

References 11 publications

Determination of Phosphine in Plant Materials: Method Optimization and Validation in Interlaboratory Comparison Tests

Determination of Phosphine in Plant Materials: Method Optimization and Validation in Interlaboratory Comparison Tests

Evaluation of the Factors Affecting the Phosphine Residue in the Fumigation–Aeration Process of Stored Wheat Using Orthogonal Array Design

Residue Dynamics Studies of Aluminum Phosphide and Magnesium Phosphide in Stored Rice Utilizing a Sulfuric Acid‐Toluene Extraction Coupled with Gas Chromatography Analysis

Contact Info

Product

Resources

About