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What are the limitations of using high volume sampler to determine RSP or TSP?
Solution
Passive deposition occurs when windblown dust deposits on a filter both before and after
sampling. Sometimes, material will be collected in size-selective inlets and it becomes re
entrained in the sample flow. Re-circulation occurs only when the blower exhaust, which
contains carbon and copper particles from the armature and brushes, is entrained in the samples
air. Recirculation can be minimized by assuring a tight seal between the blower and the sampler
housing or by ducting blower exhaust away from the sampler. Sometime, sulfur dioxide, nitrogen
oxides, nitric acid and organic vapors may absorbed on the filter medium along with the
suspended particles thereby causing positive biases.

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What are the limitations of using high volume sampler to determine RSP.docx

  • 1. What are the limitations of using high volume sampler to determine RSP or TSP? Solution Passive deposition occurs when windblown dust deposits on a filter both before and after sampling. Sometimes, material will be collected in size-selective inlets and it becomes re entrained in the sample flow. Re-circulation occurs only when the blower exhaust, which contains carbon and copper particles from the armature and brushes, is entrained in the samples air. Recirculation can be minimized by assuring a tight seal between the blower and the sampler housing or by ducting blower exhaust away from the sampler. Sometime, sulfur dioxide, nitrogen oxides, nitric acid and organic vapors may absorbed on the filter medium along with the suspended particles thereby causing positive biases.