\ 

Chemicals That Were Assigned Threshold Planning 

Quantities Different From the Calculated Index Value 

The following table shows the name and CAS number of chemicals chat were 

assigned different Threshold Planning Quantities (TPQs) from their calculated 

index value. The reassignments were made after a chemical-by-chemical review 

of the TFQs by Agency toxicologists, engineers and chemists.. As the TPQs are 

designed to alert communities to potential hazards from the presence of 

extremely hazardous substances, it was important to determine whether the 

values assigned ware appropriate for all the physical and chemical attributes 

of the individual substances. The rationale for reassignment is given on the 

table. The table deals with ths reassigned substances in. alphabetical order. 
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Assigned TP9 Reassigned TPQ 

CAS Number Chem i ca i ( in pounds) ( in pounds) Rationale ror Reassignment 

298 - 00-0 Parath ion-methy I 10 1OO/lO,OOO Widely used pesticides are rtrlL of Tir-st concern. This silbstance should l~;~vo ;r s ~r~+i la r 

'IPQ to Parathion and Aldicarb. 

2587-90-8 Phosphorothiaic acid, 1000 500 This conapoirnd IS sim~ far to denlet011 ;II#~ rl~ot~id 

0,O-dimethyl-S- be assigned the same TPQ. 

(2-methyl phi01 ethyl ester 

129-00-0 ~y rene I00 lOOO/lO,UOO The toxiclty data llsed for the calculation may 

indicate a higher value ttran warranted. It is a common laboratory reagent. 

57-24-9 Strychnine 10 lOO/lO,OOO This should have a similar TPQ to strychnine sulfate. Its use as a rat poison would 

necess i ta te reporting by grocery and ha rdwa re 

stores iF it were assigned a very low TPQ. 

77-8 1-6 Ta bun 10 [his chemical is a warfare agent and is 

rapidly and irreversibly toxic. 

78-00-2 Tetrae thy l lead 100 This compound is rapidly absorbed and 

irreversibly toxic. 

597-64-8 Tetraethyltin 100 This compound is very volatile and irreversibly toxic. It should have a simi lar 

TPq to tetraethy l lead. 

75-74-1 Tetramethy l lead 100 This compound is rapidly absorbed and 

i rreversibly toxic. 

6633-73-9 T ha l l ous ca rbona ce 100/1U,~OO A generic tDtH value for tha l l ium sa l ts was used to recalculate the TPQ, previously 

calculated from a toxicity value. 

779 1 - 12-0 Tlia I lous chloride lOO/lO,OOO A generic lDLH value for thal l ium salts was used to recalculate the TPQ, previously 

calculated Yrom a toxicity value. 

2757- 18-8 Tha l l ous ma l ona te lOO/lO,OOO A generic lDLH value for thallium salts was used to recalculate the TPQ, previously 

calculated from a toxicity value. 

2001 -95-8 Valinomycin lOOO/lO.OOO This compound is an ant~biotic. 

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