Loading is defined as?

Loading is defined as?

• A. a measure of the amount of lead contained in dust, expressed in micrograms of lead per gram of dust (ug/g)
• B. a measure of the total amount of lead present in micrograms of lead per square foot of surface area.
• C. a measurement of lead concentration per liter of air
• D. a ratio of lead to dust by mass

Answer: (B)

Loading refers to the total amount of lead on a surface divided by the surface area, so it’s expressed as micrograms of lead per square foot (µg/ft²). This focuses on how much lead is present on a given area of a surface, not on how much lead is in the dust itself (which would be µg per gram of dust) or in the air (which would be µg per liter or per cubic meter). It’s the per-area measure used to assess surface contamination, for example after a dust wipe: you measure the lead collected and divide by the area wiped to get µg/ft².

Loading refers to the total amount of lead on a surface divided by the surface area, so it’s expressed as micrograms of lead per square foot (µg/ft²). This focuses on how much lead is present on a given area of a surface, not on how much lead is in the dust itself (which would be µg per gram of dust) or in the air (which would be µg per liter or per cubic meter). It’s the per-area measure used to assess surface contamination, for example after a dust wipe: you measure the lead collected and divide by the area wiped to get µg/ft².