Which of the following represents improper aliquot preparation?

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Multiple Choice

Which of the following represents improper aliquot preparation?

Controlled transfer is essential in aliquot preparation to prevent contamination, loss of sample, and exposure to biohazards. Pouring contents directly into the aliquot tube is improper because it can cause splashes and aerosols, making it easy to contaminate surfaces, the handler, or nearby samples and to lose or mismeasure the volume. Using a calibrated transfer device such as a pipette ensures you move a precise amount with minimal disturbance to the source. After transfer, keeping the stopper in place or recapping promptly helps maintain sterility and protect the sample from evaporation or contamination. While removing the stopper behind a splash shield can be part of safe handling, the key point is to avoid pouring directly and to use proper, controlled transfer with immediate sealing.

Controlled transfer is essential in aliquot preparation to prevent contamination, loss of sample, and exposure to biohazards. Pouring contents directly into the aliquot tube is improper because it can cause splashes and aerosols, making it easy to contaminate surfaces, the handler, or nearby samples and to lose or mismeasure the volume. Using a calibrated transfer device such as a pipette ensures you move a precise amount with minimal disturbance to the source. After transfer, keeping the stopper in place or recapping promptly helps maintain sterility and protect the sample from evaporation or contamination. While removing the stopper behind a splash shield can be part of safe handling, the key point is to avoid pouring directly and to use proper, controlled transfer with immediate sealing.

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