Total threshold limit concentration

Hazardous Waste Constituents Total threshold limit concentration Restricted Pesticides... 

In California Code of Regulations (CCR) Title 22, the State of California imposes additional requirements for the disposal of waste containing 20 inorganic and 18 organic persistent and bioaccumulative toxic substances (CCR, 1991). Hazardous characteristics of waste streams contaminated with these substances are determined as Total Threshold Limit Concentrations (TTLQ and Soluble Threshold Limit Concentrations (STLC), shown in Appendix 4. 

List of California Toxic Substances, their Soluble Threshold Limit Concentrations and Total Threshold Limit Concentrations... 

TTLC denotes Total Threshold Limit Concentration. 

CA Total Threshold Limit Concentration Toxic Materials Limits (30-d avg.) 1 mg/kg 0.0039 pg/L CELDS 1994... 

OSHA = Occupational Safety and Health Administration PEL = permissible exposure limit REL = recommended exposure limit TLV = threshold limit value TTLC = total threshold limit concentration TWA = time-weighted average USC = United States Code... 

Cal 1forni a Total threshold limit concentration for wastes 2.5 mg/kg (wet weight) CELDS 1992... 

TLC See Capacity, total lung or threshold limit concentration. 

G. Total Threshold Leaching Concentration (TTLC) and Soluble Threshold Limit Concentration (STLC)... 

Another way to evaluate risks is to calculate the sensitivity of the total risk estimates to changes in assumptions, frequencies, or consequences. Risk analysts tend to be conservative in their assumptions and calculations, and the cumulative effect of this conservatism may be a substantial overestimation of risk. For example, always assuming that short-term exposure to chemical concentrations above some threshold limit value will cause serious injury may severely skew the calculated risks of health effects. If you do not understand the sensitivity of the risk results to this conservative assumption, you may misallocate your loss prevention resources or misinform your company or the public about the actual risk. 

The early concept was that these were values which must not be exceeded in other words, they were truly maximum values. As the understanding of limits and the development of the philosophy for such limits grew, it was realized that short-term exposures to somewhat higher concentrations could be permitted without undue harm if the total exposure during the day was sufficiently below the maximum limit. This led to the development of the concept of Threshold Limit Values (TLV s) by the ACGIH. 

The amount of particulate collected on the filter is determined by weighing the filter under the same physical conditions as prior to sampling. The amount of particulate with respect to total sampling time and flow rate determines the dust concentration in milligrams per cubic meter (mg/M ). The current OSHA Threshold Limit Value for nuisance or inert respirable dust is 5 mg/M. ... 

Toxic and essential trace elements intakes were computed from food consumption data of the population in northern Italy and element concentration measurements. The results (Table 10.6) were compared with the Italian Recommended Dietary Allowance (RDA) for essential trace elements and with the Provisional Tolerable Daily/Weekly Intake (PTDI/PTWI) for toxic elements. Finally, an assessment was made of the extent to which each food contributes to the total intake of trace elements by the population under study and the most contaminated foods were also detected. On the whole, mean intake values satisfied the Italian RDA for all the essential trace elements [31], while the potentially toxic trace elements were below the relevant threshold limits. 

Uhen inhalation concentrations were determined based on a TWA (Tiioe Weighted Average) work day, the total exposure concentrations were less than 0.1 yg/m> TWA established (DREW, NIOSH 77-159, 11.01). When determined based on actual application time, exposure on 29 September of 0.205 yg/m was the largest recorded. The Threshold Limit Value-Short Term Exposure Limit (TLV-STEL) ( ) for diazinon is reported as 0.3 yg/m . Thus, based on the STEL, the exposure levels were below the 0.3 yg/m . 

---